Answer:
The speed of the ball when it hits the ground is 102.1 m/s
Explanation:
Given;
initial velocity of ball, u = 25 m/s
distance traveled by the ball = height of the building = h = 500 m
when the ball hits the ground, the final velocity, v = ?
The final velocity of the ball is given by;
v² = u² + 2gh
where;
g is acceleration due to gravity = 9.8 m/s²
v² = (25)² + 2(9.8)(500)
v² = 10425
v = √10425
v = 102.1 m/s
Therefore, the speed of the ball when it hits the ground is 102.1 m/s
When a radio telescope observes a region of space between two stars, it detects electromagnetic radiation that has a wavelength of 0.21 m. This radiation was emitted by hydrogen atoms in the gas and dust located in that region.
Required:
What is the frequency of this radiation?
Answer:
14.3 x 10^8Hz
Explanation:
Using
Frequency= speed of light /wavelength
Then substituting
3*10^8m/s / 0.21m
= 14.3 x10^8 Hz
9. A car driver brakes gently. Her car slows down front --
deceleration?
10. A train slows down from 60m/s to 20m/s in 50s.
a) What is its acceleration?
b) Write your answer in words?
11. The acceleration of car is 10m/s. If the car starts from rest,
a) What will be its speed after 10s?
b) How long it takes to reach a speed 1000m/s?
12. A sprinter has an acceleration of 5m's during the first 2 seconds of the race. What
velocity does she reach after this time?
13. A train increases its velocity from 6m/s to 10m/s. Calculate its acceleration?
14. A car travelling at 20m/s slows down to 10m/s in 25. Calculate its acceleration?
15. Leaving bus stop, the bus reaches a speed of 8m/s after 10s. What is its acceleration?
Answer:
9) This is a case of deceleration
10)-0.8 ms-2
b) acceleration is the change in velocity with time
11)
a) 100 ms-1
b) 100 seconds
12) 10ms-1
13) more information is needed to answer the question
14) - 0.4 ms^-2
15) 0.8 ms^-2
Explanation:
The deceleration is;
v-u/t
v= final velocity
u= initial velocity
t= time taken
20-60/50 =- 40/50= -0.8 ms-2
11)
Since it starts from rest, u=0 hence
v= u + at
v= 10 ×10
v= 100 ms-1
b)
v= u + at but u=0
1000 = 10 t
t= 1000/10
t= 100 seconds
12) since the sprinter must have started from rest, u= 0
v= u + at
v= 5 × 2
v= 10ms-1
14)
v- u/t
10 - 20/ 25
10/25
=- 0.4 ms^-2
15)
a=v-u/t
From rest, u=0
8 - 0/10
a= 8/10
a= 0.8 ms^-2
The modern standard of length is 1 m and the speed of light is approximately 2.99792 x 10^8 m/s. Find the time change in t for light to cover 1 m at the given speed.
Explanation:
Distance = rate × time
1 m = (2.99792×10⁸ m/s) t
t = 3.33565×10⁻⁹ s
Light is the fastest thing in the universe. The speed of light is 2.99792 x 10⁸ m/s . The time that light takes to cover a distance of 1 meter is just 3.39 x 10⁻⁹seconds.
What is speed?Speed is a physical quantity that means the distance in meter covered by a moving body in one second. The speed of light is 2.99792 x 10⁸ m/s. Light from sun only takes 8 min to travel to the earth surface.
The speed of a moving particle or wave is mathematically the ratio of distance and time. Thus time of travel can be found out from the distance and speed.
It is given that the distance travelled by light is 1 m and its speed is 2.99792 x 10⁸ m/s. Thus the time taken to travel is calculated as follows:
Time = distance/speed
= 1 m/ (2.99792 x 10⁸ m/s)
= 3.39 x 10⁻⁹s
Therefore, the time that light takes to cover a distance of 1 meter is just 3.39 x 10⁻⁹seconds.
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Can scientific ideas and concepts be changed? Why or why not?
Answer:
Yes
Explanation:
Scientific concept is a scientific theory or law that gives proof of how and why a natural event or process occurs.
Yes, scientific ideas and concepts can be changed because the research never stop and when scientists come with a new theory which is more strong than old theory, the old theory is required to be changed.
For example: In the scientific concept of classification of biodiversity, earlier organisms were classified into binomial system including plant and animal kingdoms but now we have five kingdoms that includes monera, protists, fungi, plant and animal kingdoms.
What is the relation between the gravitational force acting between any two bodies object with their masses and the distance between their centres?
Answer:
The strength of the gravitational force between two objects depends on two factors, mass and distance. the force of gravity the masses exert on each other. ... increases, the force of gravity decreases. If the distance is doubled, the force of gravity is one-fourth as strong as before.
A basketball player runs a drill in which he runs the
length of the 30.0 meter court and back. He does
this three times in 50.0 seconds.
30. m
(Not drawn to scale)
1. The magnitude of the player's total displacement
after running the drill is
(1) 0.0 m
(2) 30.0 m
(3) 60.0 m
(4) 180 m
Answer: (1) 0.0 m
Explanation: In physics, displacement is defined as the change in position of a moving object. It is a vector, so has magnitude and direction, determined by a referential create to the system, i.e., the moving object. Mathematically, displacement is calculated by: [tex]\Delta x=x_{f}-x_{0}[/tex], in which:
[tex]x_{f}[/tex] is the final position;[tex]x_{0}[/tex] is the initial postion;[tex]\Delta x[/tex] is the diplacement;For the basketball player, he runs 30m, 3 times, court and back. Assuming the initial position is 0:
[tex]\Delta x=0-0[/tex]
[tex]\Delta x[/tex] = 0.0
Since displacement is given by, only, the initial and final position and the player started at the initial point and ended at the initial point of the court, displacement is 0.
astronauts feel weightlessness, why?
Answer:
They are weightless because there is no external contact force pushing or pulling upon their body.
Explanation:
Answer:
nope because the ground created a normal force
Explanation:
1. You have a cat who has a mass of 10 kg and is
chasing a mouse with an acceleration of 10 m/s2.
If it runs into a wall what force will be exerted by
the cat?
2. You are pushing a box with 20 N of force that has
a mass of 10 kg, solve for acceleration.
3. Your dog is dragging you with a force of 100 N at
an acceleration of 4 m/s, what is your mass?
Answer:
1) F = 100N
2) a = 2 m/s²
3) m = 25 kg
Explanation:
1) F = ma ( F = ?, m = 10 kg, a = 10 m/s² )
F = 10×10
F = 100 N
2) F = ma ( F = 20N, m = 10 kg, a = ? )
20 = 10×a
10a = 20
a = 20/10
a = 2 m/s²
3)F = ma ( F = 100N, m = ?, a = 4 m/s² )
100 = m×4
4m = 100
m = 100/4
m = 25 kg
Hope that helps! Good luck!
A 4 kg kitten is sliding at 12 m/s on a horizontal frictionless surface. A constant force is applied that slows it with an acceleration of 3 m/s/s. How much work must this force do to stop the kitten
Answer:
288 Joules
Explanation:
Work= delta kinetic energy. To find the work required to stop the kitten, you have to find the delta kinetic energy between when the kitten is moving and when it is stopped. Since it is not moving when it's stopped, it has no kinetic energy. So to find the work, just find the kinetic energy of the kitten moving at 12m/s.
KE=1/2((m)(v^2)), therefore
delta KE=(1/2)*((4kg)*((12m/s)^2))-0
The work done must this force do to stop the kitten will be "288 Joules". To understand the calculation, check below.
Work done and AccelerationAccording to the question,
Mass of kitten, m = 4 kg
Speed, v = 12 m/s
Acceleration, a = 3 m/s²
We know the formula,
→ Kinetic energy, K.E = [tex]\frac{1}{2}[/tex] mv²
then,
→ ΔK.E = [tex]\frac{1}{2}[/tex] mv² - 0
By substituting the values, we get
= [tex]\frac{1}{2}[/tex] × 4 × (12)² - 0
= [tex]\frac{1}{2}[/tex] × 4 × 144 - 0
= 2 × 144
= 288 Joules
Thus the above response is correct.
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Light is emitted by electrons when they drop from one energy level to a lower level. Which transition results in the emission of light with the greatest energy?
Answer:
Level 4 to level 2
Explanation:
Electrons in an atom are contained in specific energy levels (1, 2, 3, and so on) having different distances from the nucleus. When light is emitted by electrons from one energy level to a lower level, level 4 to level 2 has the greatest energy.
Hence, the correct option is "Level 4 to level 2".
On a 100km track , a train travels the first 30km with a speed of 30km/h . How fast the train travel the next 70 km if the average speed for the entire journey is 40km/h?
Solution :-
Given :
Distance 1 = 30 km
Distance 2 = 70 km
We know that speed = distance/time
and, Average speed = total distance/total time taken
When the train acquired a speed of 30 km/hr, the time taken = 30/30 = 1 hour
Average speed = 9distance 1 + distance 2)/(time 1 + time 2)
AS time 2 or t2 is time taken for the second part of the journey of 70 km
⇒ 40 = 100/(1 + t2)
⇒ 40 + 40t2 = 100
⇒ 40t2 = 100 - 40
⇒ 40t2 = 60
⇒ t2 = 60/40
⇒ t2 = 1.5
So, t2 or time taken to travel the second part of the journey is 1.5 hours.
Speed of the second part of the journey = distance 2/time 2
⇒ 70/1.5
⇒ 46.666 km/hr or 46.7 km/hr.
Hence the answer is = 46.666 km/hr or 46.7 km/hr.
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Tysm!
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The modern standard of length is 1 m
and the speed of light is approximately
2.99792 x 10° m/s.
Find the time At for light to cover 1 m at
the given speed.
1. Atz 3.3 x 10-73
2. A = 3 x 10-6S
3. At 2 3.3 x 10-ºs
4. At 3.3 x 10-8s
5. At 3.3 x 10-10s
6. At = 3 x 10-83
7. At = 3 x 10-9S
8. AL 3 x 10-10
9. At 3.3 x 10-6S
10. AR 3 x 10-7
Answer:
he correct answer is 7 3 10⁻⁹ s
Explanation:
The speed of light is constant, so we can use the uniform motion ratios
v = x / t
t = x / v
let's calculate
t = 1 / 2.9972 10⁸8
t = 3.336 10⁻⁹ s
the correct answer is 7 3 10⁻⁹ s
Two bicyclists ride towards each other along a long straight road, each with a constant speed of 10 km/h. When they are 20 km apart, a bee begins flying from the front of one bicycle towards the other at 30 km/h. When the bee reaches the other bicycle, it immediately turns around and starts flying back towards the original bicycle at the same speed. This repeats until the bikes crash into each other and the bee is squished.
A. How many trips does the bee travel before it gets squished?
B. For how long will the bee survive?
C. What is the total distance the bee will travel?
Answer:
Explanation:
A )
As the two bicycles come closer , the time period of oscillation of bee to oscillate between the two is gradually reduced . It is akin to a pendulum with gradually decreasing amplitude . It will be infinite number of trips the bee will travel before it gets squished .
B )
The bee will survive until the two bicyclists meet each other .
time of their meeting = distance between them / their relative velocity
= 20 / ( 10 + 10 )
= 1 hour .
C )
Total distance travelled by bee during 1 hour
= time x speed of bee
= 1 x 30 km/h
= 30 km .
If the maximum acceleration that is tolerable for passengers in a subway train is 1.21 m/s2 and subway stations are located 810 m apart, what is the maximum speed a subway train can attain between stations
Answer:
v = 44.27 m / s
Explanation:
This is an exercise in kinematics since they ask the maximum speed of the train
v² = v₀² + 2 a x
a train departs with zero initial velocity
v² = 2 a x
v = √ 2ax
calculate
v = √ (2 1.21 810)
v = 44.27 m / s
in this solution we have assumed that the train uses the entire distance with acceleration
calculate the electric field acting on a proton so that proton remains stationary in a space a)2.04*10^-2 b)1.02*10^-7
Answer:
No electric field will exist.
Explanation:
Given the following:
In other to for the proton to remain stationary in space, the electric field acting on the proton will be 0 or no electric field will exist. From the formulae ;
F = qE ; where q = charge of the particle
E = electric field intensity
The electric field force = F
At a stationary position in space, the electric field intensity = 0
F = qE = q * 0 = 0.
Also according to Heisinberg, measuring the momentum and position of a quantum object becomes more and more uncertain when measured simultaneously.
Here, one of position or momentum is know, measuring the electric field becomes very uncertain.
When the arrow is released, how does the the force on the arrow (by the bow) compare to the force on the archer (by the bow)?
Answer:
hello some parts of your question is missing below is the complete question
A 60.0 kg archer standing on a friction-less ice shoots a 100g arrow at a speed of 80.0 m/s to the right .When the arrow is released, how does the the force on the arrow (by the bow) compare to the force on the archer (by the bow)?
Answer : The force on the arrow is larger than the force on the archer because the arrow has a higher final velocity
Explanation:
we can compare The force on the arrow to the force on the archer by using the final velocities of the archer and the arrow ,hence The force on the arrow is larger than the force on the archer because the arrow has a higher final velocity and this is according to Newton's law which states for a every action there is an equal reaction i.e the force applied on the arrow will be the opposite of the force on the archer
A student is conducting an experiment to determine how far a ballwill roll down a ramp based on the angle of incline what are the three possible controls for the experiment
Answer:ball, ramp, and angle
Explanation: these are the three things that are controls because you can control them
The movement of thermal energy from a warmer object to a cooler object is called a. heat. b. temperature. c. motion. d. momentum. Please select the best answer from the choices provided
The energy responsible for temperature is referred as thermal energy. the movement of thermal energy from a warmer object to a cooler object is called heat.
What is heat?Heat is energy that is transferred from one body to another as a result of a temperature difference.
When two bodies at different temperatures come into contact, energy is transferred (i.e., heat flows) from the hotter to the colder.
Thus, the correct option is A.
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12. You are building a go-cart. You want to know how you can make it go as fast as it can.
Explain how you can use both chemistry and physics to help you build your go-cart (5 points). I
Answer:
Physical measures: Reduction of internal friction, high static friction tire system
chemist. : air-fuel ratio as efficient
Explanation:
A go-Kart is a vehicle that can be with a motor or with pedals, which is in contact with the ground.
Physical measures that help increase vehicle speed are:
* Reduction of internal friction, use bearings, with greased joints to reduce friction
* Decreased friction when forward creating an aerodynamic raindrop shape, sharp at the front and with a rapid descent at the rear, but without abrupt cuts to the geometry
* Path difference for air passing through the top and bottom, to create a downward force help lower the car by increasing speed
* A high static friction tire system so you can move faster on surfaces and take turns faster
* A shifting system to have an effective torque either pedal or motor, gear shifting system
From the point of chemist.
* Obtain an air-fuel ratio as efficient as possible to increase the force per unit of fuel.
Hi i was wondering if you could help me understand Kelvins? My question on my work says "Which of the following is the SI unit used in measuring the temperature of a hot cup of coffee" and the other question says, "Which of the following would be the SI unit to use in measuring the temperature of a hot liquid?" I said both are Kelvin but i dont really understand and i dont want to be wrong.
Answer:
Hey there!
Kelvin is correct. Farenheit and Celsius are scales derived from the Kelvin scale. For example, K=C+273.15 is the conversion between Kelvin and Celsius.
Let me know if this helps :)
There are five basic health-related components that one must have in order to be physically fit.
O True
O False
Answer: the answer is true :-)
Explanation:
A current of 0.300 A through your chest can send your heart into fibrillation, ruining the normal rhythm of heart beat and disrupting the flow of blood (and thus oxygen) to your brain. If that current persists for 3.06 min, how many conduction electrons pass through your heart?
Explanation:
Given that,
Current passes through our chest is 0.3 A
The current persists for 3.06 minutes
We need to find the number of conduction electrons pass through your heart. Charge flowing divided by time equals current. Also, q = ne
[tex]I=\dfrac{ne}{t}\\\\n=\dfrac{It}{e}\\\\n=\dfrac{0.3\times 3.06\times 60}{1.6\times 10^{-19}}\\\\n=3.44\times 10^{20}[/tex]
So, [tex]3.44\times 10^{20}[/tex] electrons would pass through your heart.
A ______ is a single encased electrochemical unit, with one positive and one negative electrode, with a voltage differential across its two terminals
Answer:
Cathode: The positive electrode of a cell. Cell: A single encased electrochemical unit (one positive and one negative electrode) which exhibits a voltage differential across its two terminals.
Answer:
Cell
Explanation:
A cell is a single encased electrochemical unit (one positive and one negative electrode) which exhibits a voltage differential across its two terminals.
Greek engineers had the unenviable task of moving large columns from the quarries to the city. One engineer, Chersiphron, tried several different techniques to do this. One method was to cut pivot holes into the ends of the stone and then use oxen to pull the column. The 4-ft diameter column weighs 13200 lbs, and the team of oxen generates a constant pull force of 1500 lbs on the center of the cylinder G. Knowing that the column starts from rest and rolls without slipping, determine the velocity of its center G after it has moved 5 ft and the minimum static coefficient of friction that will keep it from slipping.
The velocity is a vector quantity. The velocity of center G of the column after it has moved 5 ft is 5.18 ft.
From work Energy equation:[tex]U_{12} = T_2[/tex]First, the potential energy of column,
[tex]U_{12} = \int\limits^5_0 {F} \, dx[/tex]
Here, the column moves from zero and displaces 5 ft.
[tex]F[/tex] - force = 1500 lbs
Thus,
[tex]U_{12 } = 7500\rm \ ft\ lbs[/tex]
Now, total kinetic energy at position 2,
[tex]T_ 2 = \dfrac 12 mv_2^{-2} + \dfrac 12 \vec I \omega_2^2[/tex]
Where,
m = 372.67 slugs
r = 2 ft
Since,
[tex]\omega_2 = \dfrac {\vec V}{r}[/tex]
So,
[tex]7500 = \dfrac {12000}{2g}v_2^{-2}+\dfrac {12000}{4g}r^2 \times \dfrac {\vec V}{r}\\\\\vec v_2 = 5.18 \rm \ ft[/tex]
Therefore, the velocity of center G of the column after it has moved 5 ft is 5.18 ft.
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Several motorboats with the same mass are used in an experiment. The forces of the different motors versus their accelerations are graphed. What is the y-intercept of this graph? (1point) Does anyone know the answer?
Answer:
C. the velocity
Explanation:
Answer:
1.) As rocket mass increases, acceleration decreases
2.) The inverse of the mass of the boat
3.) Zero
4.) When the velocity increases
5.) It increases
Explanation:
took the test, all were correct
You are in an elevator that is accelerating you upward at 4.55 m/s^2. How much time does it take you to reach a speed of 11.0 m/s?
Answer:
t = 2.01 seconds
Explanation:
It is given that,
The acceleration of the elevator is 4.55 m/s².
We need to find time taken by you to reach a speed of 11 m/s
The initial velocity of the person is equal to 0 (at rest). Let t is the time.
Using equation of kinematics as follows :
v = u +at
Acceleration = g-a and u = 0
So,
[tex]t=\dfrac{v}{g-a}\\\\t=\dfrac{11}{10-4.55}\\\\t=2.01\ s[/tex]
So, 2.01 seconds is taken to reach a speed of 11 m/s.
a taller trees has greater chance to fall down than a shorter tree during storm
Answer:
Hi! This is true.
Explanation:
During a storm, high winds are persistent. Taller trees have a longer length than short trees, making the structural integrity lesser. Shorter trees are closer to the ground and have a small chance of falling.
Hope this helped!
What is the number at the end of an isotope’s name? atomic number neutron number mass number electron number
Answer:
C) mass number
Explanation:
I got it correct on edge
Answer: c
Explanation:
1. An ant travels toward the right along a meter stick. If it starts at the 25.00 cm
mark and then travels to the 80.00 cm mark, what is its distance &
displacement?
Distance 55cm; Displacement 55cm
Answer:
The total distance traveled is 28 inches.
The displacement is 2 inches to the east.
If an ant travels toward the right along a meter stick. If it starts at the 25.00 cm mark and then travels to the 80.00 cm mark, the distance covered by the and would be 55 centimeters and the displacement covered by the ant would be 55 centimeters as well.
What is displacement?Displacement describes this shift in location.
As given in the problem statement If an ant travels toward the right along a meter stick. If it starts at the 25.00 cm mark and then travels to the 80.00 cm mark, then we have to find the distance and the displacement covered by the ant,
For a straight linear motion in a single direction, the distance is equal to the displacement covered by the object.
Thus, the the distance covered by the ant would be 55 centimeters and the displacement covered by the ant would be 55 centimeters as well.
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How is energy related to the change of state represented by the model?
Answer: atoms gain energy as a solid changes to a gas
Explanation:
Answer:
atoms gain energy as a solid changes to a gas
Explanation: