Physics Answers

 You are making an electric circuit with a battery providing 3.0 V, and two resistors of resistance of 2.0 Ohm and 8.0 Ohm

connected in parallel to the battery. What is the current out of the battery in A? 

knowing the potential difference across both resistors is 3.0 V, calculate the current going through the

2.0-Ohm resistor in A.

Show that energy transferred by energetic electron to helium atom by elastic collision is less than 0.1%.

A patient transport vehicle is running at a speed of 80 m/s. It is the decelerated at the rate of 10m/s. When will it stop?

A automobile starts from rest and is given a constant acceleration of 5 m/s². How long will it take before it attains a speed of 20 m/s?

A car running at a speed of 72 km/h is to be stopped in exactly 10 seconds. Find the uniform deceleration needed.

Calculate the moment of inertia of a thin uniform rod that is 1.45 m long and has a mass of 5 kg

around an axis at right angles to the rod and through the center.

1.A 50 N force is applied to a 20 kg cart which was displaced at 150 m from rest on a surface applying an opposing force of 30N.

1. Illustrate the free body diagram indicating all the forces acting on the cart.
2. How much work is done on the cart?
3. What is the final kinetic energy of the cart?
4. How fast is the cart moving?

2.Explain your reasoning in each item briefly and concisely.

1. Given the potential energy of a body, explain the relationship of the body’s mass and height.

Vector P has magnitude of 6 units in the direction of positive x-axis. Vector Q has a magnitude of 6√3 Units and lies in x-y plane, making an angle of 30° with positive x-axis and 60° with positive y-axis. Find the vector product of PxQ

Is it possible to do work on the gas without changing the internal energy of the gas?

An airplane starts traveling down a runway from rest for 4.0 seconds with an acceleration of 9.0 m/s2.  What is the final velocity?