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3 years ago

5

Light traveling though air strikes the surface of the four different materials shown. Which material reflects light but does not

refract it?

1 answer:

dangina [55]3 years ago

8 0

The spoons .................

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A 1.2 kg hammer slams down on a nail at 5.0 m/s and bounces off at 1.0 m/s. If the impact lasts 1.0 ms, what average force is ex

Delvig [45]

Answer:

Explanation:

Impulse results in a change of momentum

FΔt = mΔV

F = mΔV/Δt

The impulse acting on the hammer will equal the impulse acting on the nail

If we assume upward is the positive direction

F = m(vf - vi)/t

F = 1.2(1.0 - (-1.5)) / 0.001

F = 3000 N

7 0

2 years ago

Mass of trolley (m):

Nookie1986 [14]

Answer:

ij

Explanation:

4 0

2 years ago

A speed skater moving across frictionless ice at 8.4 m/s hits a 5.7 m -wide patch of rough ice. She slows steadily, then continu

malfutka [58]

Answer:

Acceleration, $a=-2.48\ m/s^2$

Explanation:

Initial speed of the skater, u = 8.4 m/s

Final speed of the skater, v = 6.5 m/s

It hits a 5.7 m wide patch of rough ice, s = 5.7 m

We need to find the acceleration on the rough ice. The third equation of motion gives the relationship between the speed and the distance covered. Mathematically, it is given by :

$v^2-u^2=2as$

$a=\dfrac{v^2-u^2}{2s}$

$a=\dfrac{(6.5)^2-(8.4)^2}{2\times 5.7}$

$a=-2.48\ m/s^2$

So, the acceleration on the rough ice $-2.48\ m/s^2$ and negative sign shows deceleration.

8 0

3 years ago

Which title best fits Rahma's note

Semenov [28]

Answer:

diffusion is the answer.

4 0

3 years ago

Read 2 more answers

Estimate how long the sun would last if it were merely a huge fire that was releasing chemical energy. Assume that the sun begin

stepan [7]

Answer:

≅ 17000 years or 1.7 x 10⁴ years

Explanation:

time= total energy/power

= (10⁸J/kg)(2x10³⁰ kg) / 3.8 x 10²⁶ J/s

= 526,315,789,473 s

= 16689 years

≅ 17000 years or 1.7 x 10⁴ years

7 0

2 years ago