Physics Answers

A 700.0-N sign hangs from the end of a uniform strut. The strut is 4.0 m long and weighs

800.0 N. The strut is supported by a hinge at the wall and by a cable whose other end is tied

to the wall at a point 3.0 m above the left end of the strut. Find the tension in the supporting

cable and the force of the hinge on the strut.

During take-off, an aircraft accelerates at 3.4 m/s2. The total mass of the aircraft is 8.0 × 103 kg. Calculate:

a) the net force acting on the aircraft during the acceleration.

b) the speed of the aircraft after 5.0 seconds of acceleration.

A block of wood of mass m = 250 g is being pulled along a surface by a force F = 20 N. The force of friction between the block

and the surface has a magnitude of 15 N as

shown. Calculate:

a) the acceleration of the block.

b) the distance moved, starting from rest, in 5.0 s.

Two objects are separated by 2500m. The first object has a mass of 1.5x105 kg and the second object has a mass of 8.5x102 kg. What is the gravitational attraction between them?

A subway train stops at two stations that are 2 km. apart. The maximum Acceleration and deceleration of the train are 2 m/s^2 and 1.6 m/s^2 Respectively and the maximum allowable speed is 20 m/s.

1. What is the time to reach a max. velocity.

2. Which of the following gives the time to travel constant speed of 20 m/s.

3. Which of the following gives the shortest possible time of travel between two stations.

3) The displacement–time graph for an oscillating pendulum is shown below. If the frequency of the pendulum is 60 Hz, what is the time interval between points a & b? (1 Dgree)

Solve for Their Momentum in SI Unit

1.) Pacific Plate moves 2in annually and has a mass on 4.34x10²² kg approximately

2.) The Rate of movement of North American Plate is 1cmper year and has a mass of 3.18x10²² kg approximately

3.) The Eurasian plate is moving about 3cmper year. It has a mass of 2.85x10²² kg approximately

A fixed mass of gas is heated inside a rigid container. As its temperature changes from T1

to T2 the pressure increases from 1x105 Pa to 2x105 Pa. Which row in the table shows

possible values for T1 and T2?

T1 T2

A 27°C 327°C

B 30°C 60°C

C 80°C 40°C

D 303 K 333 K

E 600 K 300 K

The following data were collected during a short race between two friends. Velocity (m/s) 0 0.5 1 1.5 2 2 4 6 2 0 Time (s) 0 2 4 6 8 10 12 14 16 18 a) Describe the different sections of the graph. b) Determine the acceleration over the first eight seconds. c) Determine the maximum acceleration. d) Using the graph calculate the displacement: i) over the first eight seconds ii) the total race. e) Find the maximum velocity reached by the runner

A basketball player threw the ball with an initial velocity of 30 m/s 30°above the horizontal.

a.How long it took the ball to land?

b.How high the ball flew?

c.What was its range?