Indicate (with a T of F) whether the statement is true or false. If false, change the underlined word or phrase to make the statement true. A bicycle moving at 5.0 m/s at sea level has more potential energy than a motionless bicycle at the top of a mountain. Mechanical work is calculated by multiplying the magnitude of a force times the amount of time it is applied. The SI unit for work is the joule. One joule is equivalent to LN m in SI units

A car of 850 kg drives at a constant speed of 20 m/s (appromately 45 mph). It is subject to a combination of friction and drag force of 420 N. What power is required from the car's engine to drive the car on level ground, in kW (kiloWatts)? Use g = 10 m/s2. Your answer needs to have 2 significant figure, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

An object of mass 3.00 kg is subject to a force E, that varies with the position as in the figure below. (a) Find the work done by the force on the object as it moves from x = 0 to x = 5.00 m. (b) Find the work done by the force on the object as it moves from x = 5.00 m to x = 12.0 m. (c) Find the work done by the force on the object as it moves from x = 12.0 m to x = 17.0 m. (d) If the object has a speed of 0.400 m/s at x 0, find its speed at x = 5.00 m and its speed at x = 17.0 m. F, (N) 4 3 2 x (m) 4 8 10 12 14 16 18 20

A person pulls a crate 43.5 meters along a horizontal floor by a constant force 112.3 N, which acts at 37.7 degrees. The floor is rough and exerts a friction force 49 N. What is the total net work done on the crate?

Write the expression for the work done by a constant force F applied at an angle q with respect to the displacement Dx of the object. Write the equation for the work done by a constant force over a displacement Dx in the same direction as the force. Identify every variable in each of the equations. please answer both questions

A typical human brain has a mass of 1.4 kg, which makes up about 2% of a person's mass. However, the brain requires 20% of the body's power consumption. In essence, the brain requires 10 times as much power as any other organ in the body. The average power output of the human brain is about 2.0 × 10¹ W. Assume that the brain's power output could be converted into mechanical work and calculate how high we could use this power to lift an apple (m = 0.20 kg) in one minute. Number pa Units

Bob is pulling a box of his toys of mass 15.0 kg along a rough horizontal surface for a distance of 6.00 m. The tension force in the rope is 58.0 N and the angle is 30° with respect to the horizontal. The frictional force on the box is 12.0 N.  How much work is done on the box by the normal force, in Joule? Use g = 10.0 m/s2. Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

You have two vectors: A = 7.27î + 3ĵ and B = 4î - 0.95ĵ + 12k. If vector A represents a force vector and vector B is a displacement vector, what is the magnitude of work done by this force?

A 64.0 kg cheetah accelerates from rest to its top speed of 32.5 m/s. (a) How much net work (in J) is required for the cheetah to reach its top speed?   (b) One food Calorie equals 4186 J. How many Calories of net work are required for the cheetah to reach its top speed? Note: Due to inefficiencies in converting chemical energy to mechanical energy, the amount calculated here is only a fraction of the energy that must be produced by the cheetah's body.

A man pushes a 85.9-N crate a distance of 3.7 m up a long frictionless ramp at a constant speed.  His pushing force is parallel to the ramp.  The ramp makes a 30.0-degree angle with the horizontal.  What is the work done by the man in pushing the crate? Give your answer in joules, rounded to one decimal place.