PHYSICS MIDDLE SCHOOL

Asteroids are larger than??A- planets
B- the sun
C- stars
D- meteoroids

Answers

Answer 1
Answer: the answer would be meteoroids, as a meteoroid is a broken off piece of an asteroid. hope i helped :3
Answer 2
Answer: Asteroids are larger than meteoroids

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What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has mass of 0.15 kg?

Answers

Kinetic Energy = 1/2 Mass (kg) * velocity squared (m/s)

KE = 1/2mV^2

KE = 1/2(0.15 kg)(40 m/s)^2

The answer is 120 joules.

0.5mv^2 > 0.5*0.15*40*40=120J

what is a device that transforms thermal energy to mechanical energy


Answers

I think that's heat engine.

I hope I helped :D

Which of the following are adaptions of the digestive system in land-dwelling herbivores?A. Flat teeth and longer intestinal tracts
B. More fat cells to store energy
C. Strong jaws and sharper teeth
D. Removal of ammonia through gills

Answers

Answer: A

Land dwelling herbivores have flatter teeth, to help with chewing plants (as opposed to canines to rip through flesh). They also have a longer intestinal track, this is because plants don't putrefy in the body as quickly as raw meat will, so a longer intestinal track doesn't hurt herbivores.

Answer: A

If a wave has amplitude of 2 meters, a wavelength of 2 meters, and a frequency of 10 Hz, and a period of 1 second, then at what speed is the wave moving?

Answers

Answer:

20 m/s

Explanation:

The speed of a wave is given by:

v=\lambda f

where

\lambda is the wavelength

f is the frequency

v is the speed

For the wave in this problem,

f = 10 Hz is the frequency

\lambda=2 m is the wavelength

So the speed is

v=(10 Hz)(2 m)=20 m/s

FILL IN THE BLANKS!1. Thermal energy moves more quickly through _____ than it does through ______.

2. _____ is the transfer of thermal energy due to collisions between particles of matter.

A. Conductors
B. Expansion
C. Heat
D. Insulators
E. Temperature

Answers

1. First blank is A. Conductors
Second blank is D. Insulators

2. C. Heat

a student viewing a cell with a microscope observe a cell wall, a cell membrane,and a nucleus. The presence of these structures indicates that the student is looking at a cell from a

Answers

The answer should be Plant Cell
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