PHYSICS HIGH SCHOOL

Two identical freight cars roll without friction (one at 1 m/s, the other at 2 m/s) toward each other on a level track. They collide, couple together, and roll away in the direction that _________.

Answers

Answer 1

Answer:

Answer:

They collide, couple together, and roll away in the direction thatthe 2m/s car was rolling in.

Explanation:

We should start off with stating that the conservation of momentum is used here.

Momentum = mass * speed

Since, mass of both freight cars is the same, the speed determines which has more momentum.

Thus, the momentum of the 2 m/s freight car is twice that of the 1 m/s freight car.

The final speed is calculated as below:

mass * (velocity of first freight car) + mass * (velocity of second freight car) = (mass of both freight cars) * final velocity

(m * V1) + (m * V2) = (2m * V)

Let's substitute the velocities 1m/s for the first car, and - 2m/s for the second. (since the second is opposite in direction)

We get:

$m*1 + m*(-2) = 2m*V$

solving this we get:

V = - 0.5 m/s

Thus we can see that both cars will roll away in the direction that the 2 m/s car was going in. (because of the negative sign in the answer)

Related Questions

Disregarding air resistance, what is the speed of a ball dropped from 12 feet just before it hits the ground? (Use 1 ft = 0.30 m, and use g = 9.8 m/s2.)
The following items are connected in a circuit. in which one would you find a voltage gain?a. batteryb. lampc. resistord. ammeter
A(n) _____ wave best describes a wave whose direction of travel is perpendicular to the displacement of the medium.
Suppose two clowns on skateboards are standing motionless on a smooth surface 2.0 m apart. Clown B tosses a 5.0 kg medicine ball to Clown A. After the throw the medicine ball is traveling with a speed of 10 m/s. What is the resulting velocity of Clown B after throwing the ball? *Indicate which direction is positive.
Which one of the following types of electromagnetic radiation causes certain substances to fluoresce? A. Ultraviolet rays B. Infrared waves C. X rays D. Cosmic rays

calculate the area that will experience a force of 6000N from liquid exerting pressure of 300Pa. 1kPa=1000Pa

Answers

Answer:

$A=20\ m^2$

Explanation:

Pressure

Is a measure of how much force is applied perpendicular over a given area.

It is calculated by dividing the amount of force being applied F by the area over which it is being applied A:

$\displaystyle P=(F)/(A)$

The SI unit for pressure is the Pascal (Pa), equivalent to $1\ Nw/m^2$

A pressure of 300 Pa is being exerted over an area that experiences a force of 6000 N. We are required to calculate the value of the area.

If we know the pressure and the force, we solve the above equation for A;

$\displaystyle A=(F)/(P)$

Substituting the given values:

$\displaystyle A=(6000)/(300)$

$\mathbf{A=20\ m^2}$

How to reverse the heating effects of electric curent

Answers

In order to completely reverse the heating effects of an electric current, the best way to do it is by reversing the flow of it - which is possible by terminating the current itself. This is the best possible method in removing its heat.

A bird can fly 30km/hr. How many hours does it take to fly 22,000 m?

Answers

It would take a bird .73 repeating hours.

The answer is (22/30) because 22000 m becomes 22 km.

A measurement that has both magnitude and direction

Answers

A measurementthat both magnitude and direction is a vector quantity. An example of this is amoving car. The car exerts force due to its thrust and weight that runs in it. Thiswill give us the magnitude of the car. The resulting motion of the car in termsof displacement, velocity and acceleration that determines its direction makesit a vector quantity. On the other hand, a measurement that has only magnitude isa scalar quantity. The energy exerted by the engine of the car is a scalarquantity.

In a game of darts, the dart thrower releases the dart directly at the center of the target (the "bull’s eye") with a speed of 13.0 m/s, and the dart strikes the wall, 0.23 m directly below the center of the target. How far from the wall, along the x-axis, was the dart released?

Answers

Answer:2.81 m

Explanation:

Given

speed(u)=13 m/s

dart strikes 0.23 m below

i.e. vertical distance traveled by dart is 0.23 m

considering dart motion similar to Projectile

$h=ut+(at^2)/(2)$

$0.23=0+(9.8t^2)/(2)$

$t=0.216 s$

Horizontal distance travel by dart =u\times t

$=13* 0.216=2.81 m$

A 92.0-kg skydiver falls straight downward with an open parachute through a vertical height of 325 m. The skydiver's velocity remains constant. What is the work done by the nonconservative force of air resistance, which is the only nonconservative force acting? (Assume that up is the positive direction.) a. +2.93 times 10^5 J b. 0J c. Answer is not obtainable, because insufficient information about the skydiver's speed is given. d. -2.93 times 10^5 J

Answers

Answer: Workdone293.02KJ

Explanation: The equation to use to calculate Workdone = Change in KE + Change in PE

Assuming velocity is constant,KE becomes 0

Workdone= Change in PE=mg

W=92×9.8×325=293.02KJ

Other Questions

39WERELAIS01:21:51Which type of reaction is C2H2011 - 12C + 11H202O synthesisdecompositionO oxidationcombustion

A ball is thrown horizontally from a 28-meter building with a velocity of 5.5 m/s. How far does the ball land from the base of the building? A) 56 m B) 49 m C) 35 m D) 42 m

work of 4 joules is done in stretching a spring from its natural length to 11 cm beyond its natural length. what is the force (in newtons) that holds the spring stretched at the same distance (11 cm)

How does an atom charge if all the electrons are removed