PHYSICS MIDDLE SCHOOL

Carla has four marbles that are different sizes. She wants to know how size affects the speed at which the marbles roll How could she do a scientific investigation to test this?
OA. Carla could roll a marble, a block, a ring, and a coin down a slope to see which object rolls the fastest.
OB. Carla could look up whether small or large objects roll fastest in a textbook.
Carla could roll the different sized marbles down a slope to see whether the small or large marbles roll faster
OD.
Carla could roll the marbles down different sized slopes to see which angle makes the marbles roll the fastest,
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Answer 1
Answer:

Answer:

C) Carla could roll the different sized marbles down a slope to see whether the small or large marbles roll faster

Hope this helps!

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MIDDLE SCHOOL

A 6000 kg train car traveling at 2.5 m/s collides with another 6000 kg train car now they are both moving but with a speed of 1.25m/s. this an exaple of? Newton's secind law
Newton's third law
Newton's first law
The law of conservation of momentum

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It would be the aw of conservation of momentum because the weight of momentum is getting converted
HIGH SCHOOL

How many grams are in 882 μg? & The density of gold is 19.3 g/cm3.? Answer the following:
a. What is the volume, in cubic centimeters, of a sample of gold with mass 0.715 kg?
b. If this sample of gold is a cube, how long is each edge in centimeters?

Answers

How many grams are in 882 μg?
882  μg ( 1 g / 10^6  μg) = 8.82 x 10^-4 g

The density of gold is 19.3 g/cm3Answer the following:
a. What is the volume, in cubic centimeters, of a sample of gold with mass 0.715 kg? 

0.715 kg ( 1000 g / 1 kg ) ( 1cm^3 / 19.3 g ) = 37.05 cm^3

b. If this sample of gold is a cube, how long is each edge in centimeters?

V = s^3 = 37.05 cm^3
s = 3.33 cm
HIGH SCHOOL

A 55kg female bungee jumper fastens one end of the cord (made of elastic material) to her ankle and the other end to a bridge. Then she jumps off the bridge. As the cord is stretching it exerts an elastic force directed up on her. Calculate her acceleration at the instant the chord exerts an elastic force of 825N [up] on her.

Answers

Downward force = gorce of gravity (her weight) = 55 x 9.8 = 539 newtons / / / Upward force = 825 newton. / / / Net force = 825 - 539 = 286 newtons upward. / / / F = m a / / / a = f / m = 286 / 55 = 5.2 meters per second squared Upward. / / / Note: We don't know the length of her fall before the bungee kicks in. At the moment we're dealing with, when her acceleration is 5.2 m/s-squared Upward, her velocity can very well be Downward.
When the jumper jumps off , there is always a force of gravity acting on her which is 55*9.8 =539N downwards. (Considering the acceleration due to gravity to be 9.8)
Since the question says that the force exerted by cord is 825N upwards , it is obvious that the pseudo force of acceleration must act downwards and the jumper must be moving upwards.
Assume the acceleration at that instant be 'a' .
Pseudo force  = mass *  acceleration = 55*a
Since the body is in dynamic equilibrium , all forces must cancel out.
Hence ,
539 +55*a = 825
=> 55*a = 825-539 = 286
=> a = 286/55 = 5.2
So , acceleration at that instant was 5.2 m/s²
MIDDLE SCHOOL

PLEASE HELP!!! FIRST IS BRAINLIEST!!! The material or substance that a wave moves through is called a _____
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Answers

The material or substance that a wave moves through is called a medium. The medium affects the speed of the wave that passes through it. One factor that affects the speed of a wave is the type of medium. Some waves move faster in solids and some waves move faster in liquids and gases. Another factor that affects wave speed is the temperature of the medium. 

1. A Medium

2.  One of these 4, the refractive index of the medium  Choose whichever are on the test.

3. properties and nature of medium, Hope this helps.
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