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Amanda [17]
3 years ago
6

A(n) 0.47 kg softball is pitched at a speed of 10 m/s. The batter hits it back directly at the pitcher at a speed of 29 m/s. The

bat acts on the ball for 0.019 s. What is the magnitude of the impulse imparted by the bat to the ball? Answer in units of N · s.
Physics
1 answer:
nadya68 [22]3 years ago
8 0

Answer:

18.33 Ns

Explanation:

As the pitch back speed has the opposite direction as before, the change in velocity would be

\Delta v = v_2 - v_1 = 29 - (-10) = 39 m/s

So the change in momentum of the ball would be the product of its velocity change and its mass

\Delta p = \Delta v m = 39 * 0.47 = 18.33 kgm/s

This is equals to the impulse acted on the ball by the bat, which is 18.33 Ns

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8 0
3 years ago
A spring required a force of 5.0 n to compress it 0.1 m. how much work is required to stretch the spring 0.4 m
lions [1.4K]

Answer:

20N

Explanation:

The force (Hooke's Law) is proportional to the deformation. To extend the spring 4 times longer, you will need 4 times the force. In total, 20 N

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4 years ago
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55. (III) A uniform circular plate of radius 2R has a circular hole of radius R cut out of it. The center of the smaller circle
Aleksandr [31]

Answer:

P = 0.27R from the center

Explanation:

Given,

The radius of the uniform circular plate, R = 2R

The radius of the hole, r = R

The center of the smaller circle from the center is, d = 0.8R

The center of mass of a circular disc with a hole in it given by the formula

                               P = dr²/R² - r²

Where P is the distance from the center of mass located in the line joining the two centers opposite to the hole.

Substituting the given values in the above equation,

                               P = 0.8R x R² / 4R² - R²

                                  = 0.27R³/R²

                                  = 0.27R

Hence the center of mass of plate is at a distant  P = 0.27R from the center

6 0
3 years ago
At a particular moment in time and space, we measure an electromagnetic wave's electric and magnetic fields. We find the electri
kolbaska11 [484]

Answer:

The direction of propagation is west.

Explanation:

We know that electromagnetic waves (EM-waves) are transverse in nature. EM-waves containing electric field and magnetic field both are perpendicular to the each other ( E ⊥ B ).

Transverse waves : the direction of propagation is perpendicular to the direction of amplitude which we call transverse waves. eg : light waves, water waves, gravitational waves etc.

Here, in our case the direction of electric field is pointing upward to the plan of the screen and the direction of magnetic field is pointing north

∴ E × B = k

Where E = direction of electric field, B = direction of magnetic field, k = direction of propagation at particular instant.

Above equation follows right hand rule. put your finger toward you (out of the screen) then curl to the north side then  the thumb will give you the direction of the wave propagation ( west side )

In our case west direction is the direction of wave propagation.

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