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3 years ago

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1 answer:

Ierofanga [76]3 years ago

3 0

I can’t answer this

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You are conducting an experiment inside a train car that may move along level rail tracks. A load is hung from the ceiling on a

allochka39001 [22]

Answer:

b.

c.

e.

h.

Explanation:

If we consider the ball,the tension is not balance by weight then the force acting will be non zero.It means that train car in not inertial frame of reference.And the same time the train car must accelerated with respected to the earth.It is not moving straight path.When train is in rest position but the string will be at the constant angle.

So the following option are correct:

b.

c.

e.

h.

6 0

3 years ago

A rolling ball has 3,276) of energy, what is it's mass when it is rolling at a velocity of 53m/s? what is the mass

hram777 [196]

Initial velocity U = 0

Final velocity V = 32.23 m/s

Explanation:

Given that a coin is dropped from the top of the Tower of Pisa, 53m above the ground.

What is the coin's initial velocity ?

Since the coin is dropped from the tower, the initial velocity U will be equal to zero.

Therefore, U = 0

But the final velocity V will be calculated by using the formula

V^2 = U^2 + 2gH

V^2 = 0 + 2 × 9.8 × 53

V^2 = 1038.8

V = sqrt ( 1038.8)

V = 32.23 m/s

sorry if did not help :(

3 0

3 years ago

By means of a rope whose mass is negligible, two blocks are suspended over a pulley, as the drawing shows, with m1 = 12.1 kg and

puteri [66]

Answer:

14.8 kg

Explanation:

We are given that

$m_1=43.7 kg$

$m_2=12.1 kg$

$g=9.8 m/s^2$

$a=\frac{1}{2}(9.8)=4.9 m/s^2$

We have to find the mass of the pulley.

According to question

$T_2-m_2 g=m_2 a$

$T_2=m_2a+m_2g=m_2(a+g)=12.1(9.8+4.9)=177.87 N$

$T_1=m_1(g-a)=43.7(9.8-4.9)=214.13 N$

Moment of inertia of pulley= $I=\frac{1}{2}Mr^2$

$(T_2-T_1)r=I(-\alpha)=\frac{1}{2}Mr^2(\frac{-a}{r})=\frac{1}{2}Mr(-4.9)$

Where $\alpha=\frac{a}{r}$

$(177.87-214.13)=-\frac{1}{2}(4.9)M$

$-36.26=-\frac{1}{2}(4.9)M$

$M=\frac{36.26\times 2}{4.9}=14.8 kg$

Hence, the mass of the pulley=14.8 kg

6 0

3 years ago

The immersed volume of body in a liquid depends on density of the liquid. TRUE or FALSE?

miss Akunina [59]

Answer:

True - Archimedes Principle states that the buoyant force on an object is equal to the weight of the liquid displaced.

8 0

2 years ago

A 10kg ball has a momentum of 40 kg.m/s. What is the ball’s speed.

Whitepunk [10]

Answer:

<h2>4 m/s</h2>

Explanation:

The speed of the ball can be found by using the formula

$s= \frac{p}{m} \\$

p is the momentum

m is the mass

From the question we have

$v = \frac{40}{10} = 4 \\$

We have the final answer as

<h3>4 m/s</h3>

Hope this helps you

7 0

3 years ago