An airplane of mass 2867 kg flies at a constant horizontal velocity. The force of air resistance on it is 2225 N. What is the net force on the plane (magnitude and direction)?
(a) How much does a 70.0 kg person weigh on the Earth? (b) How much would she weigh on the Moon (gmoon = 0.166g)? (c) How much would she weigh on a neutron star where gstar = 1.431011g?
A 0.125 kg frozen hamburger patty has two forces acting on it that determine its horizontal motion. A 2.30 N force pushes it to the left, and a 0.800 N force pushes it to the right. (a) Taking right to be positive, what is the net force acting on it? (b) What is its acceleration?
There are two forces acting on a box of golf balls, F1 and F2. The mass of the box is 0.750 kg. When the forces act in the same direction, they cause an acceleration of 0.450 m/s2. When they oppose one another, the box accelerates at 0.240 m/s2 in the direction of F2. (a) What is the magnitude of F1? (b) What is the magnitude of F2?
A planet and an asteroid, with mass considerably smaller than that of the planet, collide head on. Which statement is correct?
Since the planet has greater mass, the magnitude of its force on the asteroid is greater than the magnitude of the asteroid's force on the planet.
The force of the planet on the asteroid is equal in magnitude to the force of the asteroid on the planet.
Only the planet exerts a force, while the asteroid is demolished and exerts no force on the planet.
During the collision the planet and the asteroid merge into a single body and exert no forces on each other.
Nothing can be stated about the forces without more detailed knowledge of the collision.
A 50-kg box is dragged along a horizontal surface at constant speed, as shown. If needed, use g = 10 m/s2. For an angle of 20 and coefficient of kinetic friction of 0.4 between the box and the surface, the magnitude of the dragging force F is most nearly
A child sits still on a swing that is supported by two chains. Each chain makes a 15.0 angle with the vertical. The child's mass is 25.0 kg. What is the tension in each chain? (Ignore the mass of the seat and chains.)
The blocks in the diagram are connected by a massless cord passing over a massless, frictionless pulley. The tabletop is frictionless and a horizontal force F is pulling the block on the table, causing it to accelerate to the left at 3 m/s2. If needed, use g = 10 m/s2. The tension in the cord is most nearly
cannot be determined from the information given