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3 years ago

13

A man standing on a bus remains still when the bus is at rest. When the bus moves forward and then slows down the man continues

moving forward at the original speed. This is an example of the effect of
a. gravity.
b. weight.
c. velocity.
d. inertia.

2 answers:

never [62]3 years ago

8 0

Matter has a property that makes it have a tendency to remain at its original motion. We call this property inertia. This is also the reason why a man standing on the bus continues moving forward despite the bus slowing down. He will have the tendency to go to the same direction prior to the change. Thus, the answer is D: inertia<span>.</span>

Inessa05 [86]3 years ago

5 0

D. Inertia because i got it right in my test

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lozanna [386]

Answer:

The value is $KE = 259.6 \ J$

Explanation:

From the question we are told that

The weight of the horizontal solid disk is $W = 805 \ N$

The radius of the horizontal solid disk is $r = 1.58 \ m$

The force applied by the child is $F = 49.5 \ N$

The time considered is $t = 2.95 \ s$

Generally the mass of the horizontal solid disk is mathematically represented as

$m_h = \frac{W}{ g}$

=> $m_h = \frac{805}{ 9.8 }$

=> $m_h = 82.14 \ N$

Generally the moment of inertia of the horizontal solid disk is mathematically represented as

$I = \frac{1}{2} * m * r^ 2$

=> $I = \frac{1}{2} * 82.14 * 1.58^ 2$

=> $I = 102.5 \ kg \cdot m^2$

Generally the net torque experienced by the horizontal solid disk is mathematically represented as

$T = I * \alpha = F * r$

=> $\alpha = \frac{ F * r }{ I }$

=> $\alpha = \frac{ 49.5 * 1.58 }{ 102.53 }$

=> $\alpha = 0.7628$

Gnerally from kinematic equation we have that

$w = w_o + \alpha t$

Here $w_o$ is the initial angular velocity velocity of the horizontal solid disk which is $w_o = 0\ rad/s$

So

$w = 0 + 0.7628 * 2.95$

=> $w = 2.2503 \ rad/s$

Generally the kinetic energy is mathematically represented as

$KE = \frac{1}{2} * I * w^2$

=> $KE = \frac{1}{2} * 102.53 * 2.2503 ^2$

=> $KE = 259.6 \ J$

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Answer:

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Explanation:

I have explained in the image attached below.

From the explanation, the correct ones are;

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Answer:

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