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A police officer is driving due north at a constant speed of 28 m/s relative to the ground when she notices a truck on an east-west highway ahead of her, traveling west at high speed. She finds that the truck's speed relative to her car is 44 m/s (about 99 mph). On a sheet of paper, sketch the vector triangle that shows how the truck's velocity relative to the ground is related to the police car's velocity relative to the ground and to the truck's velocity relative to the police car. The sketch need not be to scale, but the velocity vectors should be oriented correctly and bear the appropriate labels. What is the truck's speed, relative to the ground?
A bicyclist makes a trip that consists of three parts, each inthe same direction (due north) along a straight road. During thefirst part, she rides for 22 minutes at an average speed of6.50 m/s. During the second part, she rides for 36 minutes ata..
A particle moves along the x axis. It is initially at the position 0.180 m, moving with velocity 0.210 m/s and acceleration -0.210 m/s2. Suppose it moves with constant acceleration for 4.50 s.
The potential difference across a typical cell membrane is about 76 mV. How much work is done on a singly ionized potassium ion moving through the membrane
a space vehicle is coasting at a constant velocity of 20.5 ms in the y direction relative to a space station. the pilot
A horizontal force does 50 J of work on a box, while the kinetic friction force, between the box and the floor, What is the cange inn the box's kinetic energy
A railroad car of mass 2.48 x 104 kilogram is moving with a speed of 3.82 m/s. Calculate the speed of the four cars after the collision
Assumed that for the couple in the figure below, you were told that the girl's mass was equal to that of the boy. The boy has a velocity of v = +0.40 m/s. What would be the girl's velocity in this case?
A person pulls a toboggan for a distance of 32.7 m along the snowwith a rope directed 24.9 ° above the snow. The tension in therope is 91.6 N. (a) How much work is done on thetoboggan by the tension force? (b) How much workis done if the same tension..
A sledge with bricks has a total mass of 180.0 kg and is pulled at a constant speed by a rope inclined at 20 degrees above the horizontal. The sledge moves a distance of 20 m on a horizontal surface.
The springs of a 1800kg car compress 5.4mmwhen its 64kg driver gets into the driver's seat.If the car goes over a bump, what will be the frequency of oscillations
What is the horsepower of a 1,500.0 kg car that can go to the top of a 349.0 m high hill in exactly 1 minute?
The 66.5 kilogram climber is supported in the "chimney" by the friction forces exerted on his shoes and back. Calculate the minimum normal force he must exert
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