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3 years ago

PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!

Physics

2 answers:

Natasha_Volkova [10]3 years ago

7 0

Ok srry bout last time but the answer is A) kelvin: time the reason is because everything else is a SI. Hope this helps and TURTLE

Diano4ka-milaya [45]3 years ago

4 0

Im not sure but i think its a or b im pretty sure

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How much gravitational potential energy does a 45.2 kg object have when it is 21.9m above the ground?

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Answer:

Explanation:

The formula for gravitational potential energy is

Ep = m · g · h Assuming that the acceleration is g = 10m/s²

Ep = 45.4 · 10 · 21.9 = 9,942.6 J

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2 years ago

A record player turntable initially rotating at 3313 rev/min is braked to a stop at a constant rotational acceleration. The turn

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Answer:

(A) It will take 22 sec to come in rest

(b) Work done for coming in rest will be 0.2131 J

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We have given the player turntable initially rotating at speed of $33\frac{1}{3}rpm=33.333rpm=\frac{2\times 3.14\times 33.333}{60}=3.49rad/sec$

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So final speed $\frac{3.49\times 75}{100}=2.6175rad/sec$

Time t = 5.5 sec

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$\alpha =\frac{\omega -\omega _0}{t}=\frac{2.6175-3.49}{4}=-0.158rad/sec^2$

(a) Now final velocity $\omega =0rad/sec$

So time t to come in rest $t=\frac{0-3.49}{-0.158}=22sec$

(b) The work done in coming rest is given by

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2 years ago

The spring in the muzzle of a child's spring gun has a spring constant of 730 N/m. To shoot a ball from the gun, first the sprin

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Answer:

a. V=11.84 m/s

b.x=0.052m

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a).

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$v_i=6.1 m/s$

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$V=\frac{v_i}{sin(31)}=\frac{6.1m/s}{sin(31)}$

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$K_k=\frac{1}{2}*K*x^2$

No friction on the ball so:

$x^2=\frac{2*K_k}{K}$

$x=\sqrt{\frac{2*0.053kg*9.8m/s^2*1.9m}{730N/m}}$

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