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GarryVolchara [31]

3 years ago

15

An object 7 cm tall is placed at different locations in front of a concave mirror whose radius of curvature is 64 cm. Determine

the magnification of the image when the object distance is 27 cm.

1 answer:

cestrela7 [59]3 years ago

3 0

The Asante was fhhbbd

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21) A youngster having a mass of 50.0 kg steps off a 1.00 m high platform. If she keeps her legs fairly rigid and comes to rest

zlopas [31]

Answer:

-22,150 N

Explanation:

When the youngster jumps off the platform, during the fall her initial potential energy is converted into kinetic energy, according to the law of conservation of energy. Therefore, we can write:

$mgh=\frac{1}{2}mu^2$

where the term on the left is the potential energy while the term on the right is the kinetic energy, and where

m = 50.0 kg is the mass of the youngster

$g=9.8 m/s^2$ is the acceleration due to gravity

h = 1.00 m is the heigth of the platform

u is the speed of the youngster as she reaches the floor

Solving for u,

$u=\sqrt{2gh}=\sqrt{2(9.8)(1.00)}=4.43 m/s$

Then, when the youngster hits the floor, the force exerted on her during the deceleration is given by:

$F=\frac{\Delta p}{\Delta t}=\frac{m(v-u)}{\Delta t}$

where $\Delta p$ is her change in momentum, and where

m is the mass

v = 0 is the final velocity (she comes to a stop)

u = 4.43 m/s is the initial velocity

$\Delta t=10.0 ms =0.010 s$ is the duration of the collision

Substituting,

$F=\frac{(50.0)(0-4.43)}{0.010}=-22150 N$

And the negative sign means the direction of the force is opposite to the motion (so, upward).

6 0

4 years ago

John is hiking and notices a small stream of water flowing down the side of the mountain. What part of the water cycle is John o

Alexus [3.1K]

Answer: Runofff

Explanation: because it said that it is going down the side of the mountain

3 0

3 years ago

What characteristics of a force can be measured?

Helga [31]

Direction and Strength can be measured of force

6 0

3 years ago

While playing her guitar , karen plucks one string with increasing levels of force. What effect does this have on the sound prod

Lena [83]

Answer:

The amplitude of vibration of string will increase due to which loudness of sound will increase

Explanation:

As we know that the guitar is based on the principle of Resonance. When string of the guitar vibrates at a given frequency then the sound produced in the hollow part of the guitar will also be at same frequency.

This is known as resonance condition, so guitar will produce same frequency sound as that of frequency of string.

Now if the string is plucked with increasing level of force then it will increase the amplitude of vibrations of the string due to which the sound produced in the guitar will also be of same level.

So here we can say that amplitude and intensity of sound related as

$I = kA^2$

so on increasing amplitude the intensity will increase and hence it will produce loud sound

8 0

3 years ago

Read 2 more answers

Which from radiation from the electromagnetic spectrum is MOST LIKELY to cause mutations in growing tissues, and should be MOST

Novay_Z [31]

Answer:

gamma rays

Explanation:

because they have the highest in energy there fore it can cause some major damage

3 0

3 years ago