A girl standing on top of a roof throws a stone into the air with velocity +v. She then throws a similar stone directly downwards with a velocity -v. Compare the velocities of both stones when they reach the ground.
Answer: The two stones will have different final velocity due to different distance covered ( height ) reaching the ground at different time.
Explanation:
Throwing a stone into the air with velocity +v means she throws the stone with an upward velocity. She then throws a similar stone directly downwards with a velocity -v.
The two stones will have different final velocity due to different distance covered ( height ) reaching the ground at different time.
Why is energy required to compress a spring?
A) the spring has chemical bonds
B) the spring is at room temperature
C) thé position of the spring is being changed
D) the spring is metal
A bus increases its speed from 30km/h to 60km/h in 2hours.Calculate the acceleration of the bus.pls give proper answer
Answer:
15km/hr²
Explanation:
speed =v-u/t (v=final speed,u=initial speed ,t=time taken)
60-30/2
=15km/hr²....
Is a reflection matter?
Answer:
Yes, because everything bounce off in every surface around any object.
Explanation:
Which object experiences the greatest gravitational force? A)car B)fire truck C)plane D)human
Answer: C Plane
Explanation: According to Newton's law, gravitational force is proportional to the product of masses and inversely proportional to the square of distance between them.
Gravitational force depends on mass. The bigger the mass, the more the magnitude of the gravitational force. Since plane is assume to have the highest mass in the options, we can therefore conclude that plane will experience the highest gravitational force.
7. A truck traveling west on the highway experiences an acceleration to the east. What could be the cause of this acceleration?
the truck speeding up as it travels down a hill
the truck veering left or right as it changes lanes
the truck driver pressing on the brakes
the truck driver pressing on the accelerator pedal
if plotted the voltage or current produced by an alternator forms a curve called a _____ wave.
A. Pulsed
B. Hertz
C. Sine
D Sawtooth
Answer:
the correct answer in the C wave type sine
Explanation:
In an alternating energy system the wave formed is a sine wave. Therefore it is said that the current or voltage produced is a sine wave toppi but
V =V₀ sin (kx-wt)
therefore the correct answer in the C wave type sine
What does wave speed have to do with all SONAR AND RADAR technologies?
What does the medium have to do with SONAR vs RADAR?
Explanation:
1) Radar uses radio waves, which are a type of electromagnetic energy. Sonar uses the echo principle by sending out sound waves underwater or through the human body to locate objects. Sound waves are a type of acoustic energy. Because of the different type of energy used in radar and sonar, each has its own applications.
2)Radar systems operate using radio waves primarily in air, while sonar systems operate using sound waves primarily in water (Minkoff, 1991). Despite the difference in medium, similarities in the principles of radar and sonar can frequently result in technological convergence.
Answer:
1) Radar uses radio waves, which are a type of electromagnetic energy. Sonar uses the echo principle by sending out sound waves underwater or through the human body to locate objects. Sound waves are a type of acoustic energy. Because of the different type of energy used in radar and sonar, each has its own applications.
2)Radar systems operate using radio waves primarily in air, while sonar systems operate using sound waves primarily in water (Minkoff, 1991). Despite the difference in medium, similarities in the principles of radar and sonar can frequently result in technological convergence.
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Explanation:
• D= 50 m
• S= 40 m/s
• T= ?
Answer:
1.25s
Explanation:
D = 50m
S = 40 m/s
T = ??
D = S × T
50m = 40 m/s × T
50/40 = T
5/4 = T
1.25s = T
As light from a star spreads out and weakens, do gaps form between the photons?
Answer:
There are no gaps in space between the photons as they travel. If you were to look at a wave then you'd come to a conclusion that indeed that there aren't any gaps unless they are specifically placed.The light from a distance star indeed spreads out and weakens as it travels, but this just reduces the wave strength and does not introduce gaps.
How do you describe the frequency of waves perceived by the observer from the moment the source appears to the moment it disappears ?
Answer: the frequency increases and decreases.
Explanation: According to doppler effect, the frequency of waves tends to increase as the source approaches and decrease as the source disappears.
The Doppler effect occurs when a source of waves and/or observer move relative to each other, resulting in the observer measuring a different frequency of the waves than the frequency that the source is emitting.
The load across a 120-V power supply consists of three resistances are R1 = 10 Ω, R2 = 30 Ω, and R3 is unknown. If R2 has a difference of potential of 45 V across it, find the other voltage drops across the other resistors, the current through each resistor, and R3.
In acceleration, if you were taking distance measurements of a free falling
object at one-second intervals, you would see the object moving ______ at each measurement interval.
A. the same amount
B. less and less
C. farther
D. a small amount
Answer:
C --> Farther
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During a workout, a football player pushes a blocking dummy a distance of 30 m. While pushing the dummy the same distance
a second time, what would the player need to change to be certain that power output increases?
The player would need to use a greater force and take more time.
The player would need to use a greater force and take less time.
The player would need to use a smaller force and take more time.
The player would need to use a smaller force and take less time.
Answer:
The correct option is (b).
Explanation:
The output power of any object is given by the work done divided by time taken i.e.
[tex]P=\dfrac{W}{t}\\\\P=\dfrac{Fd}{t}[/tex]
F is applied force
t is time taken
To increase the power output, the player would need to use a greater force and take less time. Hence, the correct option is (b).
if it takes 150N of force to move a box 10 meters. what is the work done on the box?
Answer:
1500 Joules
Explanation:
Work = Force x Distance
When multiplying by 10 you simply shift all the digits to the
left and append a 0 to the end.
so 150 x 10 = 1500 Joules
Answer:
1500J
Explanation:
w = fd
f=150N. d=10meters
f= (150)(10)
f= 1500 J
If the temperature of an object is 30° C, which of the following temperatures would indicate the MOST heat that was removed from this object? A. A. 40° C B. B. 30° C C. C. 20° C D. D. 10° C
Answer: 10° C
Explanation:
The heat loss from the body can be defined as the condition in which the heat is moved out from the body and the body cools down.
In this case the heat from the body is lost so that its overall temperature decreases. This states that the temperature of the body should be below 30° C.
If most of the heat from the body having 30° C is removed, the correct option will be 10° C. The heat loss is 20° C in this case.
Hence, the correct answer is option D.
Answer:
The answer is D. I hope this helped you. I just did this same question.
Explanation:
The Bohr model of the atom suggest that the protons and neutrons are found in the nucleus and the electrons orbit the nucleus much like planets around the sun. How is our modern model of the atom different from this model? A) Neutrons are not found in the nucleus. B) The nucleus is much larger than first thought. C) The electrons contain smaller parts called quarks. D) The electrons move around the nucleus in an electron cloud
Answer:
I think it is D
Explanation:
the Bohr model says that electrons whizz around the atomic nucleus in the same way that the earth goes around the sun - but rather than being bound by gravity, it is bound by electromagnetic forces.
wind blows at the speed of 30m/s across a 175m^2 flat roof if a house.
what is the pressure difference between inside the house and the outside of the house just above the roof? (assume the air pressure inside the house is atmospheric pressure)
what is the force on the roof due to pressure difference?
The pressure difference between inside the house and the outside of the house is 540 Pa.
Pressure based problems:Using Bernoulli's equation.
[tex]P1+\frac{1}{2} \rho v1^2 = P2 + \frac{1}{2} \rho v2^2 \\\\P1 + 0 = \delta P = \frac{1}{2} \rho v2^2 \\\\\delta p = \frac{1}{2}(1.2)(30)^2\\\\\delta p = 540 pa[/tex]
Using pressure definition:
ΔP = F / A
F = 9.45 × 10⁴ N
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What is the function of the cornea?
Its opening allows light rays to enter the eye.
Its muscles control its shape to help focus light.
Its inner surface sends nerve impulses to the brain.
Its curved surface focuses light.
Answer: B
Its muscles control its shape to help focus light.
Explanation:
The main function of a cornea is to help focusing the light ray into the eye lens.
Eyelids opening allows light rays to enter the eye.
While optic nerve inner surface sends nerve impulses to the brain.
Cornea can also function as a window lens that focuses light into the eye lens with its ability to refract and bend light into the eye lens.
Answer:
Its curved surface focuses light
Explanation: (Gradpoint)
How are living things organized into domains and kingdoms? Check all that apply
Answer:
Organisms are classified into domains and kingdoms based on their cell type, their ability to make food, and the number of cells in their bodies.
Explanation:
there
As the car goes through the valley in part A the car's speed is 15 m/s, its mass is 20 kg and the radius of valley (r) is 5 meters, determine the magnitude of the centripetal force acting on the car. *
Answer:
Centripetal force, F = 900 N
Explanation:
We have,
Speed of a car is 15 m/s
Mass of the car is 20 kg
Radius of the valley is 5 m
It is required to find the magnitude of the centripetal force acting on the car. The centripetal force acting on the car is due to the motion in circular path. The centripetal force is given by :
[tex]F=\dfrac{mv^2}{r}\\\\F=\dfrac{20\times (15)^2}{5}\\\\F=900\ N[/tex]
So, the centripetal force of 900 N is acting on the car.
50pts What is the medium of sound? Question 2 options: water solids gases air, liquids, or solids
Answer:
A medium is just a material through which an energy wave can propagate. This can include air, steel, glass, etc.
Its water solids gases air
Answer:
hey!
your answer is
Sound medium is a substance in which sound waves travel. Air, for example, is a sound medium.
Explanation:
solids and water are also mediums
hope this helps
60m27Co → 6027Co Predict the type of radioactive emission produced from the decay of metastable cobalt-60 to cobalt-60. Describe this type of emission and its reaction to an electric field. A) During the radioactive decay, alpha particles are released. These positive particles are attracted to the negative plate in the electric field and represent a ground energy level. B) Beta particles are released during the radioactive decay. These negative particles are attracted to the positive plate in the electric field and represent an excited energy state. C) Radioactive gamma decay is produced by the reaction. This neutral electromagnetic radiation allows the isotope to return to its ground state and is not attracted to the electric field. D) Both types of radioactive emissions, particles and electromagnetic radiation, are produced during this decay. None of these are attracted to the electric field and both present an intermediate level. Eliminate
please help!!!!
An increase in oil exploration has lead to an increased demand for this mineral produced in Nevada.
A) barite
B) fluorite
C) pyrite
D) sphalerite
Answer:barite
Explanation:barite is in fuel
which organism is a producer
1-oak tree
2-mushroom
3-mountain lion
4-butterfly
Answer:
Answer 1, oak tree
Explanation:
producer organisms are organisms that are mostly photosynthetic organisms like plants, some bacterias and unicellular organisms like euglena.
So the answer is 1 an oak tree because it is photosynthetic.
To see the others mushroom may be a plant like organism but it is not photosynthetic because it doesn't contain chlorophyll.
Mountain lions are not photosynthetic that means they are heterotrophs( organisms that cann't make their own food).
And butterflies are also heterotrophs
HELP ME I'M DESPERATE PHYSICS EASY 40 POINTSS
1.A car moving with a speed of 108 km/h is brought to rest in a distance of 60 m. How much time did the car take to stop?
2 seconds
4 seconds
6 seconds
8 seconds
2.A student standing on the ground next to a tall building throws a ball straight up with a speed of 39.2 m/s. If it takes the ball 4 seconds to reach the same height as the top of the building, how tall is the building?
a.44.1 m
b.78.4 m
c.161.7 m
d.235.2 m
3.A boy throws a ball with an initial velocity of 19.6 m/s and it returns to his hands in 4 seconds. What maximum height does the ball reach?
4.9 m
9.8 m
19.6 m
39.4 m
Answer:
1.ans. The car take 2 seconds to stop.
the relationship between frequency and wavelength is:
a. direct
b. inverse
c. not related
Answer: A
Wavelength and frequency of light are closely related. The higher the frequency, the shorter the wavelength. Because all light waves move through a vacuum at the same speed, the number of wave crests passing by a given point in one second depends on the wavelength.
How much time will it take for a bug to travel 5 meters across the floor if it is
traveling at 1 m/s?
5 m
5 m/s
6 m/s
55
Answer:
It will take 5 seconds
Explanation:
What is the kinetic energy of a 24-kg mass that is moving with a velocity of 2 m/s?
Answer:
1/2mv^2
1/2*24*2^2
answer=48
Answer:
48 J
Explanation:
Kinetic energy can be found using the following formula:
[tex]KE=\frac{1}{2}mv^2[/tex]
where m is the mass in kilograms and v is the velocity in m/s.
We know the mass is 24 kilograms and the velocity is 2 m/s Therefore, substitute 24 in for m and 2 in for v.
[tex]KE=\frac{1}{2}*24*2^2[/tex]
Evaluate the exponent first. 2^2 is the same as multiply 2, 2 times.
2^2=2*2=4
[tex]KE=\frac{1}{2}*24*4[/tex]
Multiply 24 and 4
[tex]KE=\frac{1}{2} *96[/tex]
Multiply 96 and 1/2, or divide 96 by 2.
[tex]KE=48[/tex]
Add appropriate units. Kinetic energy uses Joules, or J
[tex]KE=48 Joules[/tex]
The kinetic energy is 48 Joules
Which is an example of a compound machine?
ramp
bicycle
crowbar
seesaw
Answer:
A bicycle.
Explanation:
A compound machine is a machine consisting of multiple simple machines.
A bicycle contains 3 simple machines. A lever, pulley, and wheel-and-axle.
all other choices are simple machines.
Hope this helps!
-MoCKEry
Answer:
I think its bicycle
Explanation: