Other Physics Answers

Calculate the increase in volume of 0.1L of mercury when its temperature changes from 10⁰C to 35⁰C?

A copper bar is 2.5 m long at 15⁰C. What is the change in the length of the bar when it is heated to 35⁰C?

Lesson Thermodynamics Processes

1. An engine bought by an engineer rated a transfer of 5,000 J of energy from a hot reservoir during one cycle and dissipated 3x10³J. Find the efficiency of the engine.

2. A particular heat engine has a mechanical power output of 5.00 kW and an efficiency of 25.0%. The engine expels 8.00x10³ J of exhaust energy in each cycle. Find (a) the energy taken in during each cycle and (b) the time interval for each cycle

Two charges q = 6 µC and q2 = +10 µC are placed 12 cm apart. Another charge, q=2 μC is placed in the middle. Determine the magnitude and direction of the force acting on qs by the charge qi and 92.

Data required: G = 6.67 x 10-¹¹ N m² kg-²

mass of the Earth = 6.0 x 10^24 kg radius of the Earth = 6.4 x 10^6 m gravitational field strength close to the surface of the Earth is 9.8 N kg-1 15

1.) What is the gravitational potential energy of a 60 kg student on the surface of the Earth? What then, is the minimum energy that would be required to get this student completely out of the Earth’s gravitational field?

2.) You’re in the design of mission carrying humans to the surface of the planet Mars, which has a radius of 3.38 x 106 m and a mass of 6.24 x 1023 kg. The Earth weigh of the Mar’s lander is 39,200 N. Calculate its weight and the acceleration due to Mar’s gravity at 6.0 x 106 m above the surface of Mars.

Suppose the distance in question 1 is tripled. What happens to the forces between the two objects

Lesson : thermodynamics processes

Write at least five examples of reversible processes and five irreversible processes.

A 5 kg box on a horizontal table is pushed by a horizontal force of 15 N as shown

below. If the coefficient of friction is 0.4, will the box move?

A 60-kg person in an elevator accelerated downward at 3 m/s2

. If acceleration due to

gravity is 10 m/s2

, what is the normal force exerted by elevator’s floor on person?

A 5-kg object moves around a circular track of a radius of 18 cm with a constant

speed of 6 m/s. Find

(a) The magnitude and direction of the acceleration of the object.

(b) The net force acting upon the object causing this acceleration.