Physics Answers

If a spring is doubled in length, then the potential energy stored in the spring will be

A child starts sledding from rest, going down a 40-m-long 7.5° incline, then coasting across a horizontal stretch. The mass of sled + child is 35 kg, and the coefficient of kinetic friction is 0.060.
Determine how much energy that is transferred to thermal energy.

m,= 3 kg and m;= 15 kg are connected by strings over pulleys to m;= 2 kg in Figure. There isn't friction force on surface. The direction of acceleration a is given in Figure. (a) Draw the free-body diagram.

(b) Find the acceleration

(c) Find the tensions in the strings.(g=9.8 m/s2 sin37=0.6 cos 37=0.8)

A child starts sledding from rest, going down a 40-m-long 7.5° incline, then coasting across a horizontal stretch. The mass of sled + child is 35 kg, and the coefficient of kinetic friction is 0.060.
What is the total time for the ride?

Kyle is driving his car at 15 m/s when he noticed that he is approaching a stalled truck that is approximately 35m away . He steps on the brakes and the car stops 1.0 m away from the stalled truck . At what rate did the car slow down ? Assume that Kyle's reaction time is 0.20s . Reaction time is the time for a person to notice , think and act in response to a given situation .

A ball is launched from the lab table, with an initial velocity of 2.5 m/s. If the table is 0.7 m high, how far from the table does it land? How long does it take to land?

A sports car and a motorbike both have good acceleration. The car of mass 1200 kg, provides a driving force or 7200 N. What is its acceleration?

a piece of cloth was carried by wind and seen rising up in the sky and after some time it was suspended in air. state the mathematical expression of the forces acting on the object when suspended in air.

two insect A( -3,2,0) and B(1,1,-3) fly towards a point C(0,2,0) at the same speed.which will arrive first

John drags an object of 10N through a distance of 0.02m for a time of 20secs. Calculate the work done