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Sedaia [141]
3 years ago
8

Joe Average throws an apple vertically into the air, and then catches it at the same height. The apple is in the air for 2.5s. W

hat is the apple's velocity the moment it's thrown? (choose the correct number of significant figures for your answer) _m/s
Physics
1 answer:
pogonyaev3 years ago
6 0

Answer:

<em>The apple's velocity when it's thrown is 12.25 m/s</em>

Explanation:

<u>Vertical Launch Upwards</u>

In a vertical launch upwards, an object is launched vertically up without taking into consideration any kind of friction with the air.

If vo is the initial speed and g is the acceleration of gravity, the time it needs to reach the maximum height is:

\displaystyle t=\frac{v_o}{g}

Once it reaches the maximum height, the object takes the same time to go back to the launch point.

The apple thrown by Joe Average takes 2.5 s to complete the whole flight, thus the time it went up is t=2.5/2=1.25 seconds.

From the equation above, we solve for vo:

v_o=gt= 9.8*1.25

v_o=12.25\ m/s

The apple's velocity when it's thrown is 12.25 m/s

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A car accelerates for 10 seconds. During this time, the angular
bagirrra123 [75]

Answer:

the angular acceleration of the car is 1.5 rad/s²

Explanation:

Given;

initial angular velocity, \omega_i = 10 rad/s

final angular velocity, \omega_f = 25 rad/s

time of motion, t = 10 s

The angular acceleration of the car is calculated as follows;

a_r = \frac{\omega_f - \omega_i }{t} \\\\a_r = \frac{25-10}{10} = 1.5 \ rad/s^2

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4 0
3 years ago
A 7.0kg skydiver is descending with a constant velocity
Vikentia [17]

Answer:

The air resistance on the skydiver is 68.6 N

Explanation:

When the skydiver is falling down, there are two forces acting on him:

- The force of gravity, of magnitude mg, in the downward direction (where m is the mass of the skydiver and g is the acceleration due to gravity)

- The air resistance, R, in the upward direction

So the net force on the skydiver is:

F=mg-R

where

m = 7.0 kg is the mass

g=9.8 m/s^2

According to Newton's second law of motion, the net force on a body is equal to the product between its mass and its acceleration (a):

F=ma

In this problem, however, the skydiver is moving with constant velocity, so his acceleration is zero:

a=0

Therefore the net force is zero:

F=0

And so, we have:

mg-R=0

And so we can find the magnitude of the air resistance, which is equal to the force of gravity:

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6 0
4 years ago
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Anna11 [10]

Answer:

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If we look at the compound, we will discover that it is an ionic compound. The compound is comprised of Ca^2+ and S^2-.

The cation Ca^2+ is the calcium ion while the anion S^2- is the sulphide ion hence the compound is rightly named calcium sulphide.

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