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AlexFokin [52]
3 years ago
11

The four balls have different masses and speeds.

Physics
2 answers:
atroni [7]3 years ago
8 0
<h2>Answer:</h2>

The balls whose velocity and mass is given and momentum of the balls are ranked as C, A, D, B from greatest to least.

<h2>Explanation:</h2>

Momentum is the quantity of physics. Momentum is the product of mass and velocity of the object. Rate of change in momentum is called as force, change in momentum is called impulse. The units of momentum is kg.m/s  

Momentum is represented as P which is given by the formula:

P = m \times a

Now to calculate the momentums of balls in which speed and mass was given,

<u>Take Ball A: </u>

Mass = m_A = 0.7 kg, Speed = a_A = 15.0 m/s

Momentum (P_A) = 0.7 \times 15.0

Therefore,

P_A = 10.5 kg.m/s

Momentum of ball A is 10.5 kg.m/s

<u>Take Ball B: </u>

Mass = m_B = 1.2 kg, Speed = a_B = 5.5 m/s

Momentum (P_B) = 1.2 \times 5.5

Therefore,

P_B = 6.6 kg.m/s

Momentum of ball B is 6.6 kg.m/s

<u>Take Ball C: </u>

Mass = m_C = 2.5 kg, Speed = a_C = 5.0 m/s.  

Momentum (P_C) = 2.5 \times 5

Therefore,

P_C = 12.5 kg.m/s

Momentum of ball C is 12.5 kg.m/s

<u>Take Ball D: </u>

Mass = m_D = 5.0 kg, Speed = a_D = 1.5 m/s.

Momentum (P_D) = 5.0 \times 1.5

Therefore,

P_D = 7.5 kg.m/s

Momentum of ball D is 7.5 kg.m/s

On comparing the values of momentum,

C>A>D>B

g100num [7]3 years ago
5 0

Answer:

C, A, D, B

Explanation:

You just need to calculate the momentum of each ball, by p=m*v

pA = 0.7kg*15m/s = 10.5 kg-m/s

pB = 1.2kg*5.5m/s = 6.6 kg-m/s

pC = 2.5kg*5m/s = 12.5 kg-m/s

pD 5kg*1.5 = 7.5 kg-m/s

Rankin them, we will have: C, A, D, B.

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Answer:

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Explanation:

FOR CONSTANT KINETIC ENERGY:

The kinetic energy of a body depends upon its speed according to its formula:

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So, for Δv = 0 m/s

ΔK.E = 0 J

So, for keeping kinetic energy constant, the books must be moved at constant speed without acceleration.

FOR CONSTANT POTENTIAL ENERGY:

The potential energy of a body depends upon its height according to its formula:

ΔP.E = mgΔh

So, for Δh = 0 m/s

ΔP.E = 0 J

So, for keeping potential energy constant, the books must be moved at constant height.

So, the correct option is:

<u>a. by moving the book without acceleration and keeping the height of the book constant</u>

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As a woman walks, her entire weight is momentarily placed on one heel of her high-heeled shoes. Calculate the pressure exerted o
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3.6 x 10⁶ Pa

Explanation:

A = Area of the heel = 1.50 cm² = 1.50 x 10⁻⁴ m²

m = mass of the woman = 55.0 kg

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Force of gravity on the heel is given as

F = mg

Inserting the values

F = (55) (9.8)

F = 539 N

Pressure exerted on the floor is given as

P = \frac{F}{A}

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Monochromatic light falls on two very narrow slits 0.046 mm apart. Successive fringes on a screen 6.20 m away are 8.9 cm apart n
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Answer:

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Explanation:

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Where;

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d is the distance between the two slits = 0.046 mm = 0.046 x 10^(-3) m

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