Category: Physics

Will mark in a heat engine, if 500 j of heat enters the system, and the piston does 300 j of work, what is the final internal (thermal) energy of the system if the initial energy is 1,500 j? 1,300 j 800 j 200 j 1,700 j explain your answer!

10 m/s^2 is an example of which vocabulary word?

Neglecting friction if a pendulum bob has 100 joules of kinetic energy at the bottom of its swing how much potential energy does it have at the top of its swing

An electric current in a conductor varies with time according to the expression i(t) = 110 sin (120πt), where i is in amperes and t is in seconds. what is the total charge passing a given point in the conductor from t = 0 to t = 1/180 s?

When a bow releases an arrow, the arrow required 200 N of force. The arrow was able to cover 200 m before it
fell to the ground.
a. How much work was required of the shooter? Be sure
to use correct units. (W=F*d)
b. Describe the system (closed? open? system?
boundary? surroundings? Energy types and
transformations.)

A car has a unibody-type frame and is supported by four suspension springs, each with a force constant of 12400 N/m. The combined mass of the car’s frame and everything inside it (the engine, the seats, the passengers, etc.) is 1500 kg. Because of worn-out shockabsorbers, the car vibrates up and down every time it is driven over a pothole. What is the frequency of this vibration? Answer in units of Hz.

1. an 800-gram bowling ball is rolling in a straight line toward you. if its momentum is 16 kg•m/sec, how fast is it traveling?

A team of engineering students is testing their newly designed 200 kg raft in the pool where the diving team practices. The raft must hold a 730 kg steel cube with edges of length 45.0 cm without sinking. Assume the density of water in the pool is 1000 kg/m^3. The students use a crane to gently place the cube on the raft but accidentally place it off center. The cube remains on the raft for a few moments and then the raft tilts, causing the cube to slide off and sink to the bottom of the pool. The raft remains floating in the pool. In a coherent paragraph-length response, indicate whether the water level in the pool when the cube is on the bottom of the pool is higher than, lower than, or the same as when the cube is on the raft, and explain your reasoning. For both cases, assume that there is no motion of the water. The bottom of the pool is 5 m below the surface of the water. The crane is now used to lift the cube out of the pool. The cube is lifted upward at a slow and constant speed, so all drag forces are negligible.

Required:
Predict how the force exerted by the crane on the cube when the bottom of the cube is at a depth of 2.0 m compares to the force exerted by the crane on the cube when the bottom of the cube is at a depth of 4.0 m. Explain your reasoning.

In a pickup game of dorm shuffleboard, students crazed by final exams use a broom to propel a calculus book along the dorm hallway. if the 3.5 kg book is pushed from rest through a distance of 0.75 m by the horizontal 25 n force from the broom and then has a speed of 1.83 m/s, what is the coefficient of kinetic friction between the book and floor?

Rahul goes to school daily on his cycle. it is his daily observation that he
needs to apply more force to start the cycle to move, as compared to when the
cycle is in motion. explain.