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3 years ago

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Which of these physical quantities varies as an object changes its velocity? A. pressure B. mass C. weight D. momentum

2 answers:

kompoz [17]3 years ago

5 0

I believe the answer is B

Leokris [45]3 years ago

3 0

Answer: Option (D) is the correct answer.

Explanation:

Momentum means the ability of an substance or object to continue moving. In general, momentum is the product of mass and velocity. Momentum is a physical quantity.

Mathematically, p = m × v

where, p = momentum

m = mass

v = velocity

Momentum and velocity of an object can change whereas mass or weight is a fixed quantity, so mass will not change whether the object will move or not.

Therefore, when an object changes its velocity then there will also be change in its momentum.

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Answer:

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3 years ago

A mail carrier leaves the post ofﬁce and drives 2.00 km to the north. He then drives in a direction 60.0° south of east for 7.00

Oxana [17]

Answer:

12.97 km

Explanation:

In order to find the resultant displacement, we have to resolve each of the 3 displacements along the x and y direction.

Taking north as positive y direction and east as positive x-direction, we have:

- Displacement 1: 2.00 km to the north

So

$A_x = 0\\A_y = +2.00 km$

- Displacement 2: 60.0° south of east for 7.00 km

So

$B_x=(7.00)(cos (-45^{\circ}))=4.95 km\\B_y = (7.00)(sin (-45^{\circ}))=-4.95 km$

- Displacement 3: 9.50 km 35.0° north of east

So

$C_x=(9.50)(cos 35^{\circ})=7.78 km\\C_y=(9.50)(sin 35^{\circ})=5.45 km$

So the net displacement along the two directions is:

$R_x=A_x+B_x+C_x=0+4.95+7.78=12.73 km\\R_y=A_y+B_y+C_y=2.00+(-4.95)+5.45=2.50 km$

So, the distance between the initial and final position is equal to the magnitude of the net displacement:

$R=\sqrt{R_x^2+R_y^2}=\sqrt{12.73^2+2.50^2}=12.97 km$

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3 years ago

The rate of change in position at a given point in time

mamaluj [8]

Answer:

Velocity

Explanation:

The rate of change in position at a given point in time is called velocity.

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- Please see the attached picture for full solution!:)

--------------- HappY LearninG <3 ---------

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Explanation:

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