1. The Phenomenon
A toy car launcher works as follows:

There is a compressible spring that is attached to a horizontal rail, on which a toy car can roll. The toy car can be pushed back against the spring, compressing it a certain distance. There is a little hook that holds the car against the compressed spring. When the hook is released, the spring pushes the car out of the launcher, down the horizontal track.

We want to ask some questions and make some predictions about different cars as they come out of the launcher. Upon close examination of this launcher, it is noted that the
spring is always compressed the same amount each time a car is loaded into the launcher.
The spring stays put inside the launcher as the car is pushed out.
2. What we want to know or predict

• Do all cars come out of the launcher with the same KE?
• Do all cars come out of the launcher with the same speed?
• If they don’t all have the same speed when they come out, what parameters cause the difference?
• What do we need to do to get our car to have a higher speed than our friend’s cars?

3. Create a Particular Model and use it to answer the questions
Plan what you need to do in your group and how you will proceed. Be systematic.
4. Suggestions:
• Use the Energy-Interaction Model and the Spring-Mass Model.
• Consider what energy systems are involved.
• Note: The car is in contact with the spring while it is compressed and separates
from the spring just as the spring reaches its equilibrium length. During the time
that the car and spring are together, they behave as a spring-mass system.
• To simplify the notation, use “d” for the distance the spring is compressed instead
of “∆x”.

HINT! Chose an interval that includes the moment when the spring and car are moving the fastest.

A box of mass m₁ = 2.0 kg starts from rest and slides down the frictionless incline. At point A, the box encounters a (massless) spring of spring constant k. It compresses the spring a distance x = 0.25 m to point B where the speed of the box is 4.4 m/s. The first box is then removed and a second box of mass m₂ = 3.0 kg is placed on the same incline at the same initial point and let go from rest. At the same point B, the velocity of the second box is found to be 5.6 m/s. Find

(a) the vertical height h that both boxes slid through before reaching point B,

(b) the spring constant, k.

can you write about Newton's laws of motions in term paper at least three pages

An electron with a speed of 4.28

A rocket ship, with mass m=20,000kg, and engines mounted perpendicularly in the x and y directions, fires both rockets simultaneously. The engine oriented in the x-direction fires for 3s and shuts off. The engine oriented in the y-direction fires for 7s and shuts off. The force from the engine in the x-direction is 50,000N and the force from the engine in the y-direction is 100,000N. Make a scatter plot of the y-position of each particle as a function of the x-position, showing the trajectory of the rocket. Use Excel to determine the following: i) While the engines are firing, what is the acceleration of the rocket in the x and y directions? ii) After 7s, what is the velocity of the rocket in the x and y directions? iii) After 7s, what is the speed of the rocket? iv) After 7s, how far has the rocket travelled in the x-direction? How far has it travelled in the y-direction?, After 10 s? v) After 7s, what is the displacement of the rocket? After 10 s? Is the displacement of the rocket the same as the distance travelled? Explain. vi) If the mass of the rocket is doubled, what happens to the displacement? Mass (kg) Fx (N) Fy (N) ax (m/s2) ay (m/s2) 20000 50000 100000 time (s) vx(m/s) vy(m/s) v(m/s) x(m) y(m) d (m) 0 0.5 1

Currently I am working with Pull up and pull down registers and trying to understand what does it mean? But could not able to understand. I searched in Wikipedia but still confused.

An ideal gas (which is is a hypothetical gas that conforms to the laws governing gas behavior) confined to a container with a massless piston at the top. (Figure 2) A massless wire is attached to the piston. When an external pressure of 2.00 atm is applied to the wire, the gas compresses from 6.40 to 3.20 L . When the external pressure is increased to 2.50 atm, the gas further compresses from 3.20 to 2.56 L . In a separate experiment with the same initial conditions, a pressure of 2.50 atm was applied to the ideal gas, decreasing its volume from 6.40 to 2.56 L in one step. If the final temperature was the same for both processes, what is the difference between q for the two-step process and q for the one-step process in joules?

Find inductance, L, of a concentric cable composed of two cylindrical wires: a solid inner wire of a radius a = 2 mm carrying a constant current I, and a very thin cylindrical outer wire of a radius b = 5 mm and carrying a constant current ??I.

Type (at least 200 words):  Electromagnets, Magnetic Fields and Magnetic Field Strengths (no formulas only relation). Also, write about Force on a Moving Charge in a Magnetic Field and transformers. Work out easy examples using transformers and Ohm’s law.

Ugonna stands at the top of an incline and pushes a 100−kg crate to get it started sliding down the incline. The crate slows to a halt after traveling 1.50 m along the incline. (a) If the initial speed of the crate was 1.85 m/s and the angle of inclination is 30.0°, how much energy was dissipated by friction? (b) What is the coefficient of sliding friction?

A particle of charge ?7.5 mC is released from rest at the point x ? 60 cm on an x axis. The particle begins to move due to the presence of a charge Q that remains fixed at the origin. What is the kinetic energy of the particle at the instant it has moved 40 cm if (a) Q ? ?20 mC and (b) Q ? ?20 mC?

A mass of 8 kg rests on a floor with a coefficient of static friction of 0.88 and coefficient kinetic friction of 0.33. One force is applied vertically downward of 28 Newtons and another force is applied at an angle of 26 degrees below the horizontal. Calculate what the magnitude this force needs to be in order to begin to move the mass. If that force is removed and another force is applied at an angle of 26 degrees above the horizontal (the downward force is still there), calculate the force needed to begin to move the force for that situation. How much more force is needed to begin the mass, in Newtons, when the force is angled below the horizontal compared to above the horizontal?

explain how the magnetic field enables the three phenomena below

magnetic field

1 low oxygen concentration

2 reducing impurity

3 maintaining stability of melt surface for dislocation free growth

What happens to the mass of an object as it is accelerated? Why can’t objects travel faster than the speed of light?

What is meant by spectroscopy in modern physics? Give an example of an experimental result