 Physics
Kinematics
A wood block is sliding down a rough inclined surface at constant speed. What energy transformation is taking place? Kinetic energy into gravitational potential energy. Gravitational potential energy into thermal energy. Kinetic energy into thermal energy. Gravitational potential energy into kinetic energy. Physics
Kinematics
An apple of mass m rests on a flat table. The earth pulls on this apple with a force of magnitude mg, and the table exerts a normal force on the apple. What is the reaction force to the normal force from the table? The apple pulling upward on the Earth with force mg. The apple pushing down on the table with force mg. The table pushing up on the apple with force mg. The table pushing down on the floor with force mg. The table pulling upward on the Earth with force mg. Physics
Kinematics
Carrie shoots a basketball at an angle of 40° from the horizontal. It leaves her hands 6 feet from the ground with a velocity of 22 ft/s. Step 3 of 3: Determine the height of the ball when it is 10 feet away horizontally. Round to the nearest tenth. Physics
Kinematics
A football was thrown into the air at a speed of 23 miles per hour at an angle of 50° from the horizontal. Express this velocity in vector form. Round your answer to four decimals. Physics
Kinematics
A volleyball was hit into the air at a speed of 21 miles per hour at an angle of 40° from the horizontal. Express this velocity in vector form. Round your answer to four decimals. Physics
Kinematics
A canoe traveling at 60.0 km/h [N] with respect to the water ends up travelling 30.0 km/h [N 45° E] with respect to the shore, due to the current. Use your knowledge of vector components to calculate the current's velocity. Physics
Kinematics
A 0.40 kg football is thrown from a height of 1.6 m with an initial velocity of 150 m/s [R35°U]. How far will the ball travel horizontally when it lands on the ground? [C=4] Physics
Kinematics
The acceleration of a particle at any time t≥ 0 is given by ā=dv/dx=16cos2tî - 4sin3tĵ+ 6tk If the velocity and displacement rare zero at t = 0, find and at any time. Physics
Kinematics
A boat is traveling at 34 knots in a direction of 68°. It encounters wind moving at 11 knots in a direction of 15°. What is the true velocity and direction of the boat? Round to the nearest whole number. Physics
Kinematics
Arvin the Ant is on a picnic table. He travels 30.0 cm northeast, then 25.0 cm due north, and finally 15.0 cm west.. What is the direction of Arvin's net displacement? (northeast means 45 degrees north of east). 82 degrees North of East 65 degrees South of west 65 degrees North of east 82 degrees South of west Physics
Kinematics
The hole on a level, elevated golf green is a horizontal distance of 155 m from the tee and at an elevation of 12.9 m. above the tee. A golfer hits a ball at an angle of 9.4° above the horizontal and makes a hole-in-one! What was the initial speed of the ball? Physics
Kinematics
Suppose a projectile is launched vertically from a height of 33 feet and projectile reaches a maximum height of 1633 feet. Determine the initial velocity of the projectile. Physics
Kinematics
Suppose a hiker, standing near the edge of a 416 meter tall cliff, throws a rock downward vertically off the cliff at a speed of 68 meters per second. Determine the velocity and acceleration of the rock at the moment the rock impacts the ground. Round solutions to the nearest thousandth, if necessary. The rocks's velocity at the point of impact is The rocks's acceleration at the point of impact is Physics
Kinematics
Suppose an arrow is shot vertically upward, from a height of 4 feet above the ground, at a velocity of 209 feet per second. Determine the velocity and acceleration of the arrow at the moment the arrow impacts the ground. Round solutions to the nearest thousandth, if necessary. The arrow's speed at the point of impact is _____ The arrow's acceleration at the point of impact is ________ Physics
Kinematics
A ball of mass 0.075 kg is fired horizontally into a ballistic pendulum as shown in the figure above. The pendulum alone has a mass of 0.350 kg. The ball is caught in the pendulum, and the center of mass of the system rises a vertical distance of 0.145 m. (a) What is the initial speed of the ball? (b) What is the speed of the pendulum immediately after it catches the ball? (c) Find the kinetic energy loss due to the collision. Assume that g = 9.80! m/s². Show your work. Physics
Kinematics
The record distance in the sport of throwing cowpats is 81.1 m. This record toss was set by Steve Urner of the United States in 1981. Assuming the initial launch angle was 45° and neglecting air resistance, answer the following. (a) Determine the initial speed of the projectile. m/s (b) Determine the total time the projectile was in flight. S (c) Qualitatively, how would the answers change if the launch angle were greater than 45º? Explain.