Physics Answers

The air pressure at the base of a mountain is 75.0cm of mercury. Given that the average density of air is 1.25kg/m³ and the density of mercury is 13600kg/m³,calculate the height of the mountain. [Take g=10m/s²]

If a positive test charge is located between two charged spheres, A and B. Sphere A has a charge of +4q and is located 0.2 meter from the test charge. Sphere B has a charge of -2q and is located 0.1 meter from the test charge. If the magnitude of the force on the test charge due to sphere A is F, what is the magnitude of the force on the test charge due to sphere B?

Stuck in the middle of a frozen pond with only your physics book, you decide to put physics in action and throw the 5.00-kg book. If your mass is 62.0 kg and you throw the book at 13.0 m/s, how fast do you then slide across the ice? (Assume the absence of friction.)

Please tell me the explanation of the answer.

A man uses a rock as a fulcrum and lifts a 300-kg boulder with a metal bar 6.00 m long. Calculare the force necessary to lift the boulder if the fulcrum is:

(a) 1.00 m from where the bar contacts the rock.

(b) 3.00 m from where the bar contacts the rock

A particle's position on the x axis is given by x=5t^3+20t^2-t+10

Fine the particle velocity function v(1)and acceleration a (t)

An airplane flies at 500km/h in a 100km/h wind. What is the velocity of the plane relative to the ground?

Two charges located on the positive x-axis has a first charge of 5nc which is 2cm from the orgin and second charge of 9nc which is 4cm from the orgin, what is the magnitude of force exerted by these two force on a third charge 5nc located at the origin

A car traveling at constant velocity of 20m/s passes a stationary police car and 15 seconds later the police car accelerates uniformly at 4m/s to reach a speed of 30m/s with which it continues. a) draw a velocity time graph. b) find where the second car overtakes the first car. c) find the distance up to which the second car overtakes the first car

A train starts from a station at point A and accelerates uniformly to a speed of 20m/s. It maintains this speed and then retards uniformly until it comes to rest at point B. The distance between the stations is 2000m the total time taken is 2 minutes.if the acceleration is twice the retardation. a) draw a velocity time graph. b) find the time for which the train is moving at constant speed. c) find it's retardation

1.How do insulator such as wearing rubber shoes reduce electrical damage to the human body?

2. Why does the production of sparks (current in air) in an explosive or flammable atmosphere should be prevented?

3. What might happen to a personif he/she approaches and reaches out for an object that is grounded if excess charge has accumulated on the person?