A block initially at rest is released and slides down a frictionless ramp as shown in the image. 4.0 m www- 30° From the point it is released to the point it instantaneously comes to rest after compressing the spring how have these quantities changed? The block's gravitational potential energy has [ Select] [ Select ] Increased The block's kinetic energy has [ Select] Decreased Stayed the sam e The spring's potential energy has [ Select] The total energy in the system has [ Select ]

1) A 10 kg metal ball slides down a smooth and curvy surface as shown in figure below. The metal ball is initially at rest. Calculate the potential energy at A, B, C and D. 30m 20m C 15m ASUS

The work done by a horizontal spring as it is being compressed from its unstretched position is   a. positive     b. negative     c. either positive or negative, depending on where you start   d. depends on how fast you are moving       e. none of the above because work is a scalar that cannot be referred to as positive or negative

Which of the following statements are true?   options:   The rest length of a spring is where it applies zero force.   The spring constant has units of N/m.   Work can be calculated for a force that depends on position.   Work is the slope of the force vs. position graph.   If we stretch a spring twice as far beyond the rest length, the spring force is 4x larger.   If we stretch a spring twice as far beyond the rest length, the potential energy is 4x larger.

1. A student of mass 40 kg caries a bag weighing 5000g from the ground floor to his class on the first floor that is 700 cm high. The work done by the boy is = 2. The above diagram shows a cyclist at different positions as she cycles over a humpback bridge. The cyclist has maximum Kinetic Energy at • and maximum Potential energy at 3. A body moves a distance of 15 m along a straight line under the action of 25 N force. If work done is 45 J, then angle between the force and direction of motion of the body will be = 4. How much is the work done in pulling up a block of wood weighing 300 N for a length of 300 cm on a smooth plane inclined at an angle of 35° with the horizontal? Answer =

When a roller coaster is at the top of a steep hill, its potential energy is maximum. When it hurdles down the slope and comes to the bottom, the potential energy reduces greatly. Hence we can say that the law of conservation of energy is not valid here since energy is destroyed. a) True b) False

Write on paper pls A work of 12 J is needed to stretch a certain spring by 30 cm a) What is the force constant of the spring? b) How much work must be done to stretch the spring 4.00 cm? c) When released from rest from 4.00 cm position what would be the speed at the unstretched position?

A HUNTER EXERTS AN AVERAGE FORCE OF 100N IN PULLING BACK THE STRIING OF HIS BOW THROUGH A DISTANCE OF 0.50M. WHEN THE ARROW OF MASS 0.20KG IS RELEASED, IT FLIES VERTICALLY UPWARDS CALCULATE THE POTENTIAL ENERGY IN THE BOW JUST BEFORE THE ARROW IS RELEASEDCALCULATE THE MAXIMUM HEIGHT REACHED BY THE ARROW