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3 years ago

Which is a unit of density? a. cm3/g b. g/cm c. g/cm3 d. ml/g

Physics

1 answer:

svetlana [45]3 years ago

7 0

C because the units for density are cubed.

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A steel ball is dropped to a wood table. What are three ways in which energy is wasted when the ball bounces?

hodyreva [135]

Answer:1. Inelastic deformation of wood and steel

2.thermal energy: hear from wood and steel

3.acoustic energy

Explanation:

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3 years ago

Density is calculated by dividing the ________ by the _________.

Natasha2012 [34]

Mass over volume is the answer

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3 years ago

What are the factors that keep a satellite in orbit

Ber [7]

They are the same factors that keep planets, asteroids, and comets in orbit. The factors are gravity.

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3 years ago

Two identical sounds are played from two laptops sitting

Delvig [45]

Answer:

Amplitude

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3 years ago

At the top of a cliff 100 m high, Raoul throws a rock upward with velocity 15 m/s. How much later should he drop a second rock f

Talja [164]

Answer:

d. 1.78s

Explanation:

The total time in the air for the second rock can be found with the next equation:

$h=v_{o}t+\frac{1}{2} gt^2$

where $h$ is the height, in this case 100m

$v_{o}$ the inicitial velocity wich is 0 since it came from rest

g is gravity and t is time

So we have:

$100=\frac{1}{2}(9.8m/s^2)t^2$

$t= \sqrt{\frac{200m}{9.8m/s^2} } =4.52s$

For the fist rock we need to find the time it takes to go up and go back down to the height it was launched:

that time is

$t_{1}=2v_{o}/g =2(15m/s)/9.8m/s^2=3.06s$

and the time the fist rock is going down from that point, we can find in a similar way we did for the fist rock, $t_{2}$ is:

$h=v_{o}t+\frac{1}{2} gt^2$

$100=(15m/s)t_{2}+\frac{1}{2}(9.8m/s^2)t_{2}^2\\0=-100 + (15m/s)t_{2}+\frac{1}{2}(9.8m/s^2)t_{2}^2$

$0=-100 + (15m/s)t_{2}+(4.9m/s^2)t_{2}^2$

solving as a quadratic equation for time we get:

$t_{2}=3.24s$

So, the total time for the first rock is:

$t_{1}+t_{2}= 3.06s + 3.24s =6.3s$

<u>This means that the second rock must be dropped 6.3s - 4.52 s = 1.78 seconds later, wich is the difference in the times that it takes for each rock to get to the bottom if the cliff.</u>

6 0

3 years ago