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3 years ago

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A piano of mass 852 kg is lifted to a height of 3.5 m. How much gravitational potential energy is added to the piano? Accelerati

on due to gravity is g = 9.8 m/s2.

1 answer:

Sedaia [141]3 years ago

4 0

Gravitational Potential Energy = Mass*Gravity*Height.

GPE = 852 * 9.8 * 3.2
GPE = 26718.72 Newtons.

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A 2.5 m -long wire carries a current of 8.0 A and is immersed within a uniform magnetic field B⃗ . When this wire lies along the

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3 years ago

A trick shot archer shoots an arrow with a velocity of 30.0 m/s at an angle of 20.0 degrees with respect to the horizontal. An a

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$u'=10.259\ m.s^{-1}$ is the initial velocity of tossing the apple.

the apple should be tossed after $\Delta t=0.0173\ s$

Explanation:

Given:

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distance of the point of tossing up of an apple, $d=30\ m$

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<u>The vertical component of the velocity:</u>

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<u>Now this height should be the maximum height of the tossed apple where its velocity becomes zero.</u>

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$0^2=u'^2-2\times 9.8\times 5.3701$

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<u>Time taken to reach this height:</u>

$v'=u'-g.t'$

$0=10.259-9.8\times t'$

$t'=1.0469\ s$

<u>We observe that </u> $t>t'$ <u> hence the time after the launch of the projectile after which the apple should be tossed is:</u>

$\Delta t=t-t'$

$\Delta t=1.0642-1.0469$

$\Delta t=0.0173\ s$

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