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frutty [35]
3 years ago
9

A baseball with a mass of 0.15 kg is moving at a speed of 40 m/s. What is

Physics
2 answers:
Afina-wow [57]3 years ago
6 0

Answer:

120 J

Explanation:

KE = mv²/2 = (0.15 kg * [40 m/s]²)/2 = 120 J

aev [14]3 years ago
3 0

Answer:

120 J

Explanation:

KE = 1/2 mv²

KE = 1/2 (0.15)(40)²

KE = 1/2 (0.15)(1600)

KE = 1/2 (240)

KE = 120 J

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Answer:

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2 years ago
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A heavy boy and a lightweight girl are balanced on a mass-less seesaw. If they both move forward so that they are one-half their
Rom4ik [11]

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b) Nothing will happen,  the sea saw will still be balanced.

Explanation:

b) Nothing will happen,  the sea saw will still be balanced.

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When two kids are balanced, the sum of torques on the seesaw will be zero.

if each kid, reduces their distances by half, then the torque of each kid will be half and the sum of torque of each on the seesaw will be zero.

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3 years ago
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15.One girl was involved in a bus crash. She told the police that she was seated in the last line of seats and that when the bus
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Then is not likely that, in a case where the bus stops suddenly, an object inside the bus flies backward in opposite direction to the previous movement of the bus.

5 0
3 years ago
A physics book slides off a table at 1.25ms and hits the ground after 0.4s
tresset_1 [31]

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7 0
3 years ago
Assume it takes 10 J to stretch a spring 10 cm beyond its natural length. Find the work required (in Joules) to stretch the spri
Lady bird [3.3K]

Answer:

W = 30 J

Explanation:

given,

Work done = 10 J

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We know,

dW = F .dx

we know, F = k x

\int dW = \int_0^{0.1} k.x dx

W = \int_0^{0.1} k.x dx

W = k[\dfrac{x^2}{2}]_0^{0.1}

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now, calculating Work done by the spring when it stretched to 0.2 m from 0.1 m.

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W = 2000 [\dfrac{x^2}{2}]_{0.1}^{0.2} dx

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W = 30 J

Hence, work done is equal to 30 J.

4 0
3 years ago
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