Mechanics | Relativity Answers

An airplane wing with an average cross sectional area of 10 m² experiences a lift force of 5000 N. What is the difference in air pressure, on the average, between the bottom and top of the wing?

Which of the following statements about gravity are true? 1. There is no gravity on the moon. II. For all objects on Earth, the force of gravity is approximately 9.8 N III. In a vacuum, all objects fall at the same rate. IV. Acceleration due to gravity can be found by dividing the force of gravity by the mass of the object. a) III and IV only Ob) II, III, and IV only Oc) II and IV only d) I, II, and Ill only e)

Two simple pendulums have the same string-length, but their bobs have different masses m1 = 25 g and m2 = 100 g. The ratio of their periods "T1 / T2" is equal to:

The bob of a simple pendulum is pulled to the right by an angle θ_0 = 10° and then released from rest. If the period of oscillation equals to one second, what is the time needed for the bob to reach the angular position θ = -5° for the first time? (g = 10 m/s^2)

On your cousin’s wedding day you leave for the church 45.0 min before the ceremony is to begins, which should leave plenty of time since the church is only 30.0 km away.On the way, however, you have to make an unanticipated stop because of road construction work.As a result, your average speed for the first 15 min is only 10.0 km/h.

What average speed do you need to have on the remainder of the trip to get you to the church on time

A 200-kg car is pushed slowly up an incline. How much work does the pushing force do in moving the cart up to a platform 1.5m above the starting point if friction is negligible?

1. A pile of 600 sheets of paper has a mass of 2 kg. The pile is 300 mm long, 200 mm wide, 50 mm thick. Calculate:
2. The thickness of one sheet (2 marks)
3. The mass of one sheet. (2 marks)
4. The volume of the pile. (2 marks)
5. The density of the paper. (2 marks)

A 10-kg projectile is fired vertically upward from the ground, with an initial velocity of 50 m/s, Fig. 13-7a. Determine the maximum height to which it will travel if (a) atmospheric resistance is neglected; and (b) atmospheric resistance is measured as Fo=(0.01v) N, where v is the speed of the projectile at any instant, measured in m/s.

Three identical point masses are placed at the corners of an equilateral triangle of sides"R". If the mass of each particle is "M" then the magnitude of the netforce on each particle is??

A man driving his sports car with 5,250 kg at auniform speed of 25 km/a in north east. What is the momentum of his sports car?