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ladessa [460]
3 years ago
5

A golf ball stays on the tee until the golf club hits it. Which of the following principles best describes why this occurs? A) N

ewton's law of action–reaction B) An object will gain more momentum if more force is applied to it across a period of time. C) Newton's law of inertia D) law of projectile motion
Physics
1 answer:
wel3 years ago
3 0

Answer:

C) Newton's law of inertia

Explanation:

The law states that a body will continue in its state of rest or uniform motion unless compel by some external forces (acted upon by an unbalanced force) to act otherwise. In this case the golf will remain in it state because the downward force of gravity is equal to the upward force of normal and the horizontal vector sum of the forces acting on the body is zero.

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Answer:

D

Explanation:

From the information given:

The angular speed for the block \omega = 50 \ rad/s

Disk radius (r) = 0.2 m

The block Initial velocity is:

v = r \omega \\ \\  v = (0.2  \times 50) \\ \\  v= 10 \ m/s

Change in the block's angular speed is:

\Delta _{\omega} = \omega - 0 \\ \\ = 50 \ rad/s

However, on the disk, moment of inertIa is:

I= mr^2 \\ \\ I = (3 \times 0.2^2) \\ \\ I = 0.12 \ kgm^2

The time t = 10s

∴

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T = I \times (\dfrac{\Delta_{\omega}}{t}) \\ \\ = 0.12 \times (\dfrac{50}{10})  \\ \\ =0.6 \ N.m

Finally, the frictional force is calculated as:

F = \dfrac{T}r{}

F= \dfrac{0.6}{0.2} \\ \\ F = 3N

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3 years ago
How can electric shock be prevented?
Nina [5.8K]

Wearing rubber or stay away from water or/ and a conductor

7 0
3 years ago
Two speakers face each other, and they each emit a sound of wavelength λ. One speaker is 180∘ out of phase with respect to the o
kolbaska11 [484]
The question ask to calculate and choose among the following is the distance of the microphone from the left - most speaker  in order to pick up the loudest  sound and the best answer would be letter C. I hope you are satisfied with my answer and feel free to ask for more if you have questions and further clarifications 
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3 years ago
A blue train of mass 50 kg moves at 4 m/s toward a green train of 30 kg initially at rest. The trains collide. After the collisi
ra1l [238]

Explanation:

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Margy is trying to improve her cardio endurance by performing an exercise in which she alternates walking and running 100.0 m ea
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Answer:

6.5 m/s

Explanation:

We are given that

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Initial speed, u=1.4 m/s

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We know that

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Using the formula

v^2-(1.4)^2=2\times 0.20\times 100

v^2-1.96=40

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v=\sqrt{41.96}

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