Physics Answers

Find the sum of A = 3i + 4j -5K and B = -i + 2j +6z

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

Suppose that two objects attract each other with force of 16 units. If the distance between the two objects is doubled, what is the new force of attraction between the two objects

Lesson : thermodynamics processes

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

How long does it take for 60.0 percent of a sample of radon to decay

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.

At what distance must two equal sphere be place so that the force of attraction between them would be 3.35×10-6N if the mass of the sphere is 90kg each