Other Physics Answers

A ball is thrown vertically upward from ground level hits the ground after 4s.calculate the maximum height it reached during it's journey

A person kicks a ball with an initial velocity 15m/s at an angle 37° above the horizontal (neglect

the air resistance). Find:

a. the total time the ball is in the air.

b. the horizontal distance traveled by the ball.

A train starts from rest from a station and travel with uniform acceleration 0.5ms for 20s.it travel with uniform velocity for another 50s,the brakes are then applied so that a uniform retardation is attained and the train comes to rest in a further 10s.sketch the velocity time graph of the motion. using your graph. calculate the total distance travelled by the train

An aircraft shell is fired vertically ward with a muzzle velocity at 100ms.calculate

a=the maximum height it can obtain

b=the time taken to teach the height

c=the instantaneous velocities at the end of 20sec and 50sec

What type of energy stored batteries hold energy in

If you have a sample size larger than 100, and a mean with a known standard deviation of the population(s), you would use ____ to test for significance.

8.0 kg stone at the end of a steel wire (Y = 2.0×1011) is being whirled in a horizontal circle

at a constant tangential speed of 12 m/s. The wire is 4.0 m long and has a radius of 1.0 × 10-3m.

Determine the strain in the wire.

 An 85 kg person is parachuting and experiencing a downward acceleration of 4.5 m/s2. The

mass of the parachute is 4.0 kg.

a) (10%) Draw free body diagram.

b) (10%) What is the upward force on the open parachute from the air?

c) (10%) What is the downward force on the parachute from the person?

Two points charges Q and +q (where q is positive) produce the net electric field. The field points parallel to the line connecting the two charges. What can you conclude about the sign and magnitude and Q? Explain your reasoning. If the lower charge were negative instead, would it be possible for the field to have the direction? Explain your reasoning.

Situation C: Two students are sitting on a swing. Student A is 40 kilograms while student B is 50 kilograms.

1) Who will swing with greater acceleration: student A or student B? Justify your answer.

2) What physical quantity was changed in this situation?

3) What relationship exists between the varying physical quantity and acceleration?

4) Combining the ideas from the three situations, how do state the law of acceleration?