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In-s [12.5K]
3 years ago
5

Dale (m = 75 kg) skis across a horizontal surface at a velocity of 5 m/s to the west. He drags his ski

Physics
1 answer:
masya89 [10]3 years ago
5 0

Answer:

1 m/s west

Explanation:

Impulse = change in momentum

J = m Δv

Taking east to be positive:

300 kg m/s = (75 kg) (v − (-5 m/s))

v = -1 m/s

His new velocity is 1 m/s west.

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A baseball bat is a lever. Which of the following explains how a baseball bat differs from a lever like a pry bar?
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Complete question is;

A baseball bat is a lever. Which of the following explains how a baseball bat differs from a lever like a pry bar?

A) In a baseball bat, effort force is smaller and is applied over a large distance, while the resistance force is smaller and is applied over a long distance.

B) In a baseball bat, effort force is smaller and is applied over a large distance, while the resistance force is smaller and is applied over a short distance.

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D) In a baseball bat, effort force is larger and is applied over a short distance, while the resistance force is smaller and is applied over a short distance.

Answer:

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Explanation:

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3 years ago
A jet airliner moving initially at 693 mph (with respect to the ground) to the east moves into a region where the wind is blowin
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Answer:

The new speed of the aircraft with respect to the ground is 1414.3 mph.

Explanation:

Given that,

Angle = 37°

Velocity of jet airliner = 693 mph

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v=v_{a}+v_{w}

We need to calculate the new speed of the aircraft with respect to the ground

Using formula for velocity

v=\sqrt{(v_{a})^2+(v_{w})^2+2v_{a}v_{w}\cos\theta}

Put the value into the formula

v=\sqrt{(693)^2+(798)^2+2\times693\times798\cos37}

v=1414.3\ mph

Hence, The new speed of the aircraft with respect to the ground is 1414.3 mph.

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