Other Physics Answers

An aircraft has a mass of 509 000 kg. The total force from its jet engine is 800 000 N. What is it's acceleration?

An accelerator at a Physics Laboratory can accelerate protons to a Kinetic energy of 10 ^ 12 * eV The rest mass of a proton is m * c ^ 2 = 9.38 * 10 ^ 6 * cV . What is the speed of that proton?

A stone is thrown at an initial speed of 125 ft/s directed 60 ° above the horizontal at the cliff of

height, y. The stone strikes the cliff 5.8 seconds after launching. Find the height of the cliff and

the speed of the stone just before impact at the top of the cliff.

What is the resultant of a displacement 6.0 miles North and one 9.0 miles East?

A skier traveling 11.0 m/s reaches the foot of a steady upward 19° incline and

glides 15 m up along this slope before coming to rest. What was the average

coefficient of friction? (use conservation of energy method or work energy

theorem)

In a common test for cardiac function (the “stress test”), the patient walks on an

inclined treadmill. Estimate the power required from a 75-kg patient when the

treadmill is sloping at an angle of 12° and the velocity is 3.1 km/h.

A 65.0-kg runner has a speed of 5.20 m/s at one instant during a long-distance

event. (a) What is the runner’s kinetic energy at this instant? (b) How much net

work is required to double his speed?

The force F = i + 3j + 2k acts at the point (1, 1, 1). (a) Find the torque of the force about the point (2, −1, 5). Careful! The vector r goes from (2, −1, 5) to (1, 1, 1)

A 85 Kg block of ice is being pushed in a straight rough road. The force exerted on the ice 300 N and acceleration of the entire system is 10 m/s^2. What is the friction force between the ice and the rough road.

4. A racer accelerates from rest at a constant rate of 2 m/s2. (a) How fast will the racer be going at the end of 6.0 s? (b) How far has the racer traveled during this time?

(Answer: a. 12 m/s & b. 36 m)