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4 years ago

7

Through Newton’s third law of motion, we know that if a rocket ship pushes down on the ground, the ground will push back up on t

he rocket ship with how much force? 1 Point
A.
Half as much Force
B.
Twice as much Force
C.
Equal Amount of Force
D.
Zero Force

1 answer:

vova2212 [387]4 years ago

6 0

<span>C.
Equal Amount of Force</span>

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Answer:

0.35 kg

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8 cm = 0.08 m

For the block to stay balance, the buoyancy force must be the same as gravity that pulls it down.

Let mass of the block be M, then the gravity would be Mg

Let water density be $\rho_w = 1000 kg/m^3$ , the buoyancy force would be the weight of water that is displaced by the submerged block.

For example, when there is no coin, block is $h_0 = 0.0312m$ submerged. The weight of water displaced must be

$W_0 = Ah_0\rho_wg = 0.0312A1000g = 31.2Ag$

Which is also the weight of block, of Mg

Therefore M = 31.2A. (1)

As coins are stacked on top of block, h increase, so as weight of water displaced and total weight of block and coins. Now let m be the total weight of coins. The gravity of block and weight must be (M+m)g. And the weight of water displaced is:

$W = Ah\rho g = (M + m)g$

$h = \frac{M}{A\rho} + \frac{m}{A\rho}$

Since the linear plot of h vs m has a slope of 0.089 m/kg, we can interpret it as

$\frac{1}{A\rho} = 0.089$

$A = \frac{1}{0.089\rho} = \frac{1}{89} = 0.011 m^2$

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An underwater diver sees the sun 50° above horizontal. how high is the sun above the horizon to a fisherman in a boat above the

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The fisherman the sun at 61.1° (90-∅2) above the horizontal.

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4 years ago

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9) An electrical appliance has a resistance of 25 N. When this electrical ap-

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(C)

Explanation:

From Ohm's law,

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