Answer:
TRUE
Explanation:
Answer:
Answer is True
Explanation:
Mark as Brainliest I hope help you
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.
Hope it helped u if yes mark me BRAINLIEST!
Tysm!
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What mathematical relationship between variables is suggested by a graph showing a diagonal line from the lower left to the upper right of the graph?
Answer:
Direct proportionality
Explanation:
The graph of variables that are directly proportional such as the temperature and volume of a gas has a graph consisting of a diagonal line that from the lower left of the graph to the upper right of the graph
According to Charles law, the volume of a given mass of gas is directly proportional to its temperature in Kelvin at constant pressure
Charles law can be represented mathematically as V ∝ T
From which we have;
V₁/T₁ = V₂/T₂, therefore, the graph of V to T has a constant slope, ΔV/ΔT.
A body weights 450 N on the surface of Earth . How much will it weigh on the surface of a planet whose masss is 1/9th mass of Earth and radius is half of radius of Earth?
Answer:
The weight of the body on the other planet would be 200 N
Explanation:
Recall that the acceleration of gravity at sea level on Earth is obtained via the general Gravitational force formula when the distance "d" is the radius of the Earth (R):
[tex]F=m\,g=G\,\frac{m\,\,m_E}{R^2} = m \,(G\,\frac{m_E}{R^2} )[/tex]
We are told that the weight of the object on Earth is 450 N, that is:
[tex]W=m\,g= m \,(G\,\frac{m_E}{R^2} )= 450[/tex]
in this other planet the acceleration of gravity will be different as shown below:
[tex](G\,\frac{m_E\,(1/9)}{(R/2))^2} )=(G\,\frac{m_E\,\,4}{R^2\,\,9} )=\frac{4}{9} (G\,\frac{m_E}{R^2} )[/tex]
so, its gravity is 4/9 that of the Earth, which now we can use to convert its weight (w) on the planet as 4/9 the weight it has on Earth:
[tex]w=m\,g_p=m\,\frac{4}{9} \,g=\frac{4}{9} \,450= 200\,\, N[/tex]
five factors predisposing a person to stroke
Answer:
the answers maybe→↓
Explanation:
high blood pressure.
cigarette smoking.
diabetes.
high blood cholesterol levels.
heavy drinking.
Answer:
5 factors predisposing a person to stroke:
1). Heart and blood vessel diseases.
2). Family genetics and history.
3). Age.
4). ArterioVenous Malformation (AVM)
5). Overweight and obesity.
Two 100-kg bumper cars are moving toward one another in opposite directions, Car A at 5 m/s meters per second, and Car B at −9 m/s negative 9 meters per second. They collide head-on with one another. Each car bounces back in the opposite direction it was moving before the collision. If after the collision the final velocity of Car B is 5 m/s meters per second, what is the final velocity of Car A?
Answer:
-9ms-1
Explanation:
it will be dat because the initially both are moving at different direction,so for momentum to be conserved they had separate leading to the switching of the two initial velocities
!!PLEASE HELP ME!!
if you were to fill a graduated cylinder to 250 mL then drop an object in that raises the water level to 300 mL, what is the volume of the object, in cubic centimeters?
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.
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 .
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 circuit has a current of 2 A. If the resistance in the circuit decreases to one-fourth of its original amount while the voltage remains constant, what will be the resulting current
Answer:
8AExplanation:
According to ohm's law, V = IR where;
V is the supply voltage (in volts)
I is the current supplied (in amperes)
R is the resistance (in ohms)
Initially, I = 2A, hence V = 2*R;
V = 2R .................... 1
If the resistance in the circuit decreases to one-fourth of its original amount while the voltage remains constant, then the new resistance will be expressed as R₂ = 1/4 R and V₂ = V
Substituting the new conditions into the ohms law formula, we will have;
V₂ = I₂R₂
I₂ is the resulting new current
V = I₂ (1/4 R)
V = I₂ * R/4
V = I₂R/4 ...... 2
Substituting equation 1 into 2 we will have;
2R = I₂R/4
2 = I₂/4
cross multiply
I₂ = 4*2
I₂ = 8A
Hence the resulting new current is 8A
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
write some interesting facts about isaac newton
Sir Isaac Newton was an English Mathematician,physicist,astronomer,theologian and author who is widely recognized as one of the most influential scientist of all time because of his discovery of gravity(force that attracts a body toward center of earth).
A jogger runs 186 meters westward, then 210 meters eastward, then 156 meters westward, and finally 8A meters eastward.
Answer:
48
Explanation:
Given that a jogger runs 186 meters westward, then 210 meters eastward, then 156 meters westward, and finally 8A meters eastward.
To calculate the displacement, let assume that the
Westward = positive
Eastward = negative
Displacement = 186 - 210 + 156 - 84
Displacement = 342 - 294
Displacement = 48 m
Since the answer is positive, the direction of the displacement will be westward.
THE LARGEST HORIZONTAL PLATES IS SEPARATED BY 4mm .The plate is at the potencial of -6V . What potencial should be applied to the upper plate to create electric feild strength 4000Vm-1 ypward in the space between the plate
Answer:
V₂ = -22 V
Explanation:
Electric potential and field are related
ΔV = - E d
where ΔV is the potential difference between the plates, E the electric field and d the separation between the plates
In this exercise we are given the parcionero d = 4 mm = 0.004 m, the potential of one of the plates V1 = -6V and the value of the electric field E = 4000 V / m
V₂- V₁ = - E d
V₂ = - Ed + V₁
V₂ = - 4000 0.004 + (- 6)
V₂ = -16 - 6
V₂ = -22 V
What is the velocity of a plane that traveled 3,000 miles from New York to California in 4.5 hours
Answer:
v = 666.67 mph
Explanation:
It is given that,
Distance from New York to California is 3000 miles
Time taken fromNew York to California is 4.5 hours
We need to find the velocity of a plane. Velocity is equal to the distance over time. So,
[tex]v=\dfrac{d}{t}\\\\v=\dfrac{3000\ \text{miles}}{4.5\ \text{hour}}\\\\v=666.67\ \text{mph}[/tex]
So, the velocity of the plane is 666.67 mph.
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".
I need to convert 234 terameters to nanometers using Dimensional Analysis. I know the answer is 2.34 x [tex]10^{23}[/tex]. How do I get there?
Explanation:
First, convert terameters to meters.
234 Tm × (10¹² m / Tm) = 234×10¹² m
Now convert meters to nanometers.
234×10¹² m × (10⁹ nm / m) = 234×10²¹ nm
In scientific notation, that's 2.34×10²³ nm.
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
Why can’t we see microwaves
Answer:
The human retina can only detect incident light that falls in waves 400 to 720 nanometers long, so we can't see microwave or ultraviolet wavelengths. This also applies to infrared lights which has wavelengths longer than visible and shorter than microwaves, thus being invisible to the human eye.
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.
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!
Suppose the initial position of an object is zero, the starting velocity is 3 m/s and the final velocity was 10 m/s. The object moves with constant acceleration. Which part of a velocity vs. time graph can be used to calculate the displacement of the object? A. the area of the rectangle under the line B. the area of the rectangle above the line C. the area of the rectangle plus the area of the triangle under the line D. the area of the rectangle plus the area of the triangle above the line
Answer:
C. the area of the rectangle plus the area of the triangle under the line
Explanation:
Based on the information provided, the velocity vs. time graph is a line with a positive slope and a y-intercept of (0, 3). The displacement is the area under this line. This area can be divided into a triangle and a rectangle. So of the options available, C is the correct one.
Answer:
C
Explanation:
There is no explanation for the answer.
PLEASE HELP WILL MARK BRAINLIEST!! I think its c, the mass but I'm not sure. Could someone not only answer but explain?
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? (1 point)
the velocity
the inverse of the mass
the mass
zero
Answer:
The answer is going to be ZERO
Explanation:
Let's find relationship
Apply Newton's second law
[tex]\\ \rm\Rrightarrow F=ma[/tex]
[tex]\\ \rm\Rrightarrow Force\propto mass[/tex]
The graph will be a straight line passing through origin so y intercept is 0
Can someone help ASAP please!
Answer:
junk food, alcohol, soda, microwave food, candy, some sugary drinks
I have the answer is B but can someone explain why with the rule?
Explanation:
Using Second equation of motion (assuming u = 0), we get :
[tex]x = a {t}^{2} [/tex]
[tex]t = \sqrt{ \frac{x}{a} } [/tex]
Therefore, Option (B) is correct.
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
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.
To learn more about displacement here, refer to this link;
https://brainly.com/question/10919017
#SPJ2
A 0.40 kilogram bird is flying at a constant speed of 8.0 m/s. What is the bird's kinetic
energy?
Answer:
12.8 J
Explanation:
Kinetic Energy: This can be defined as the energy posses by a body due to its motion. The S.I unit of kinetic energy is Joules(J)
From the question,
Ek = (1/2)mv²........................... Equation 1
Where m = mass of the bird, v = speed of the bird.
Given: m = 0.40 kg, v = 8.0 m/s.
substitute these values into equation 1 above,
Ek = 1/2(0.4)(8²)
Ek = 0.2(64)
Ek = 12.8 J
In a women's 100-m race, accelerating uniformly, Laura takes 2.00 s and Healan 3.00 s to attain their maximum speeds, which they each maintain for the rest of the race. They cross the finish line simultane- ously, both setting a world record of 10.4 s
Complete question is;
In a women’s 100-m race, accelerating uniformly, Laura takes 2.00 s and Healan 3.00 s to attain their maximum speeds, which they each maintain for the rest of the race. They cross the finish line simultaneously, both setting a world record of 10.4 s.
(a) What is the acceleration of each sprinter?
(b) What are their respective maximum speeds?
(c) Which sprinter is ahead at the 6.00-s mark, and by how much?
(d) What is the maximum distance by which Healan is behind Laura, and at what time does that occur?
Answer:
A) a_laura = 5.319 m/s² and a_healan = 3.745m/s²
B) V_max for laura = 10.638 m/s and V_max for Healan = 11.235 m/s
C) Laura is ahead of healan by 2.632 m
D) Healan is 4.471 m behind Laura
Explanation:
A) The distance traveled by each sprinter with constant acceleration would be gotten from the equation of motion which is;
s = ut + ½at²
Now, since they began at rest, thus, initial velocity(u) = 0 m/s
So, s = 0 + ½at²
s = ½at²
Now, maximum speed achieved by each of them is given by the formula;
v_max = u + at
Since u = 0, then;
v_max = at
Now, we are told that they set a world record of 10.4 s, thus;
Time taken by each to run at their maximum speed = (10.4 - t)
Distance travelled after attaining maximum speed = at + a(10.4 - t)
Thus;
Total distance covered by each sprinter = ½at² + (at)(10.4 - t)
Where;
t = time taken to accelerate to maximum speed
Since total distance covered is 100 m and she took 2 s to accelerate to max speed, then Acceleration for Laura would be calculated from;
100 = ½a(2)² + (2a(10.4 - 2))
This gives;
100 = 2a + 16.8a
18.8a = 100
a = 100/18.8
a_laura = 5.319 m/s²
Similarly, for Healan:
100 = ½a(3²) + (3a(10.4 - 3)
100 = 4.5 a + 22.2a
26.7a = 100
a = 100/26.7
a_healan = 3.745m/s²
B) From earlier we saw that max speed is;
v_max = at
Thus, for laura;
Vmax for laura= 5.319 × 2
V_max for laura = 10.638 m/s
Also, for healan;
Vmax = 3.745 × 3
V_max for Healan = 11.235 m/s
C) to find which sprinter is ahead at 6.00 s,
For Laura:
D = (½(5.319 × 2²)) + (2² × 10.638)
D_laura = 53.19 m
For Helen: D = (½(3.745 × 3²)) + (3 × 11.235) = 50.558 m
Difference = 53.19 - 50.558 = 2.632
Thus, Laura is ahead by 2.632 m
C) We are told that laura achieved max speed in 2 s while healan took 3 s. This means that when Laura had reached her maximum speed Healan was still accelerating. Thus;
From v_max = at
10.638 = (3.745)t
t = 10.638/3.745
t = 2.84 s
Distance travelled during this time is;
For Laura:
D = (½(5.319 × 2²) + (0.84)(10.638) = 19.574 m
Foe Healan:
D = (½(3.745 × 2.84²)) = 15.103 m
Difference = 19.574 - 15.103 = 4.471 m
Thus, Healan is 4.471 m behind laura