Problem 1. A tugboat exerts a constant force of 4000N toward the right on a ship, moving it a distance of 15m. What work is done?
Problem 2. A worker lift a 40-lb weight through a height of 10ft. How many meters can a 10-
kg block be lifted by the same amount of work?
Problem 3. A 10-kg block is dragged 20m by a parallel force of 26N. If μ = 0.2. What is the
resultant work and what acceleration results?
Problem 4. A 40-kg sled is pulled horizontally toward the right for 500m (μ = 0.2). If the
resultant work is 50kJ. What was the parallel pulling force?
Problem 5. What is the change in Kinetic energy when a 50-g ball hits the pavement with a
velocity of 16m/s and rebounds with a velocity of 10m/s?
Problem 6. What is the kinetic energy of a 2400kg automobile when its speed is 55m/s?
Problem 7. A 20-g projectile strikes a mud bank penetrating a distance of 6cm before
stopping. Find the stopping force F if the entrance velocity is 80m/s.

What if? physicists often measure the momentum of subatomic particles moving near the speed of light in units of mev/c, where c is the speed of light, and 1 mev = 1.6 ✕ 10−13 kg · m2/s2. based on this, what are the units of momentum for a high-speed subatomic particle in terms of fundamental si units?

Hey student studies gravity using objects that have the same mass which two objects have the greatest gravitational force acting between them a. 100kg 1.0m 100kg b. 100kg 2.0m 100kg c. 100kg 2.0m 100kg big d. 100kg big 3.0m 100kg big

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.