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stellarik [79]
3 years ago
5

7. Two rocks are rolled down a hill at different speeds. At the bottom of the hill is a brick wall. Which rock will hit the bric

k wall with more force? 4 points. Rock 1 Rock 2 mass = 242 kgmass = 321 kg velocity = 24 m/s velocity = 20 m/s2 KE = 1/2m x v2 where m = mass and v = velocity. Please show your calculations.​
Physics
1 answer:
amm18123 years ago
8 0

Answer:

I think first rock is right answer

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Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m^2. Assuming that all the photons in th
andrew11 [14]

Answer:

3.066×10^21  photons/(s.m^2)

Explanation:

The power per area is:

Power/A = (# of photons /t /A)×(energy / photon)

E/photons = h×c/(λ)

photons /t /A = (Power/A)×λ /(h×c)  

photons /t /A = (P/A)×λ/(hc)

photons /t /A = (680)×(678×10^-9)/(6.63×10^-34)×(3×10^-8)

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3 years ago
Which of the following statements describes the movement of air?
Nutka1998 [239]
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3 years ago
What relationship exists between the amplitude of a wave and amount of disturbance in the water?
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3 years ago
An archer defending a castle is on an 15.5 m high wall. He shoots an arrow straight down at 22.8 m/s. How much time does it take
kodGreya [7K]

Answer:

  about 602 milliseconds

Explanation:

The motion can be approximated by the equation ...

  y = -4.9t^2 -22.8t +15.5

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When y=0, the arrow has hit the ground.

Using the quadratic formula, we find ...

  t = (-(-22.8) ± √((-22.8)^2 -4(-4.9)(15.5)))/(2(-4.9))

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The positive solution is ...

  t ≈ 0.60195193

It takes about 602 milliseconds for the arrow to reach the ground.

8 0
3 years ago
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oksian1 [2.3K]
The answer is most likely D. hope that helped 
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3 years ago
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