PHYSICS HIGH SCHOOL

Two objects collide and bounce apart. Assuming no outside forces act on the system, which best describes the total momentum after the collision?It is always greater than it was before the collision.
It is often greater than it was before the collision.
It is always the same as it was before the collision.
It is often the same as it was before the collision.

Answers

Answer 1
Answer:

Answer:

It is always the same as it was before the collision.
Answer 2
Answer:

Answer:

The answer is C on Edge

Explanation:

Related Questions

A train travels with a constant speed of 36 miles per hour. How far can it travel in 1 hour 30 minutes?
Which of these is NOT an event that helped make the Moon as it is today?a. Iron sank into Earth's core. b. Plate tectonics caused lava to flow. c. Earth and a planetesimal collided. d. The lunar surface melted and was bombarded by meteoroids
What is an important similarity between sound and light?a. Both are transverse waves. b. Both are longitudinal waves. c. Both travel with same speed in air. d. Both can show interference effects.
if a gas has a gage pressure of 156 kpa its absolute pressure is approximately .....A... 56 kPa ....B....100 kPa.......C......256 kPa....D...300 kPa.....
To pull a 50 kg crate across a horizontal frictionless floor, a worker applies a force of 210 N, directed 20° above the horizontal. As the crate moves 3.0 m, what work is done on the crate by (a) the worker's force, (b) the gravitational force on the crate, and (c) the normal force on the crate from the floor? (d) What is the total work done on the crate?

An atom of the element chromium has an atomic number of 24 and a mass number of 52. How many electrons are in an uncharged atom of chromium?

Answers

Chromium is represented by the element Cr with an atomic number of 24 and a molar mass of 52 gram per mole. The number of protons in the Chromium atom is the atomic number, so it has 24 protons. And the protons of chromium atom is equal to the number of electrons, so 24 electrons.

Answer:

24

Explanation:

Which best describes how geothermal energy is used to make electricity? A.
Rocks are split to release energy that drives a steam turbine attached to an electrical generator.
B.
Heat energy from below the ground converts water to steam to drive a steam turbine attached to an electrical generator.
C.
Heat energy from below the ground drives liquid water though a turbine attached to an electrical generator.
D.
Heat energy from below ground heats and pressurizes air that drives a turbine attached to an electrical generator.

Answers

Heat energy from below the ground converts water to steam to drive a steam turbine attached to an electrical generator

Which property of physical changes explains why matter is conserved in a physical change? The arrangements of particles do not change, and the bonds between atoms do not break. Mass, not energy, changes in a physical change. Energy and mass change in a physical change. The bonds between atoms do not break; it is only the arrangement that changes.

Answers

The property of physical changes that explains why matter is conserved in a physical change is - the bonds between atoms do not break; it is only the arrangement that changes.

Answer: it's D

Explanation:

A subway train starts from rest at a station and accelerates uniformly at 1.8m/s^2 for 15 sec. then it runs at a constant speed for the next 35 sec. before decelerating at 2.0m/s^2 until it comes to rest at the next station. FIND THE DISTANCE between the stations and the AVERAGE SPEED of the train.(please show step by step and the formula that is used. Thank you!)

Answers

This looks so scary just because there are so many parts to it.
Take them one at a time:

First piece:
From rest, accelerates 1.8 m/s² for 15 sec.
Speed at the end of the 15 sec = 1.8 x 15 = 27 m/s
Distance covered = (average speed) x (time) = (13.5) x (15) = 202.5 meters

Middle piece:
Starts this piece at 27 m/s.
Runs at constant speed for 35 sec.
Covers (27 x 35) = 945 meters
Finishes this piece (15 + 35) = 50 seconds after leaving the first station
Finishes this piece (202.5 + 945) = 1147.5 meters from the first station.

Last piece:
Starts this piece 50 seconds after leaving the first station,
         1147.5 meters from it, still moving at 27 m/s.
Decelerates at 2.0 m/s² .
--> It takes 27/2.0 = 13.5 seconds to come to a stop.
--> Distance covered during this piece = (average speed) x (time)
           = (13.5 m/s) x (13.5 sec) = 182.25 meters
Finishes this piece (50 + 13.5) = 63.5 seconds after leaving the first station
Finishes this piece (1147.5 + 182.25) = 1,329.75 m from the first station  

Distance between the stations (along the track) = 1,329.75 meters.

Average speed = (total distance) / (total time) = 1,329.75 / 63.5 = 20.941 m/s.

I sure hope I didn't make any stupid arithmetic blunders here,
because I really don't feel like going back and checking it.
Let me know, and I'll fix them.

What type of lens is used to make objects appear smaller and clearer convex or concave?

Answers

The answer is Concave lenses

Which of the following statements is an accurate description of vibrations? A. Neither ultrasonic nor infrasonic vibrations can be heard by humans.

B. The frequency of infrasonic vibrations is much too high to be heard by humans.

C. Ultrasonic vibrations have a frequency lower than the range for normal hearing.

D. Infrasonic vibrations are used in sonar equipment as well as to detect flaws in steel castings.

Answers

So we want to know what statement is an accurate description of vibrations. So humans can hear sound frequencies from 20-20000 Hz. Below 20 Hz is infra sound and above 20000 Hz is ultra sound. Humans cant hear both infra sound and ultra sound so the correct answer is A.

Infrasonic and ultrasonic vibrations can’t be heard by humans because they’re outside of the range of frequencies that can be detected. Infrasonic vibrations have a lower frequency than can be heard by the human ear; ultrasonic vibrations have a higher frequency than can be heard by the human ear. Infrasonic vibrations can be felt if the amplitude is great enough. Ultrasonic vibrations are utilized in sonar equipment and in applications to detect flaws in steel castings and to remove grease or foreign material from machine-part surfaces.
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