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A 55-kg person on skis is going down a hill sloped at 30° from the horizontal. The coefficient of friction between the skis and the snow is 0.17. What would be the magnitude of the acceleration?
A backpack full of books weighing 59.0 N rests on a table in a physics laboratory classroom. A spring with a force constant of 150 N/m is attached to the backpack and pulled horizontally, as indica
A bicycle wheel has a diameter of 64.1 cm and a mass of 1.81 kg. Assume that the wheel is a hoop with all of the mass concentrated on the outside radius. The bicycle is placed on a stationary stand
The second object has its mass changed to 2m2, and the distance is changed to r/4. What is the magnitude of the new gravitational force?
A car travels along a straight line at a constant speed of 45.5 mi/h for a distance d and then another distance d in the same direction at another constant speed. The average velocity for the entire
A 25 kg chair initially at rest on a horizontal floor requires 373 N horizontal force to set it in motion. Once the chair is in motion, a 308 N horizontal force keeps it moving at a constant velocit
The safe speed (no friction needed to stay on the run) for the smaller radius curve is v. What is the safe speed on the larger radius curve?
The angle between the support cable and the horizontal is 32°, and the angle between the boom and the horizontal is 48°.Find the tension in the support cable. Find the magnitude of the force
Find the minimum aperture diameter of a camera that can resolve detail on the ground the size of a person (2.0 m) from an SR-71 Blackbird airplane flying at an altitude of 29 km. (Assume light with
By how much will the spring stretch if the mass moves along a circular path of radius 0.480 m at a rate of 1.88 revolutions per second?
An infinitely long line of charge has a linear charge density of 8.00×10-12 C/m. A proton is at distance 16.0 cm from the line and is moving directly toward the line with speed 1200 m/s. How
What must be the muzzle speed of the package so that it travels completely around the Moon and returns to its original location?
A 100.0 resistor, a 50.0 resistor, and a 40.0 resistor are connected in parallel and placed across a 12.0 V battery. a) What is the equivalent resistance of the parallel circuit?
Many people mistakenly believe that the astronauts orbiting the earth are "above gravity." Calculate the acceleration due to gravity, g, for space shuttle territory, 245 kilometers above the earth's
Assuming a constant acceleration for the sled, what distance does it travel during the speeding-up phase? (b) What is the net work done on the sled during the time interval?
You're driving down the highway late one night at 18 m/s when a deer steps onto the road 35 m in front of you. Your reaction time before stepping on the brakes is 0.50 s , and the maximum decelerati
On a level road with its brakes on, a car traveling at 100 km/hr stops within 85 m when the brakes lock and the car slides.
A 79 g arrow is fired from a bow whose string exerts an average force of 95 N on the arrow over a distance of 79 cm. What is the speed of the arrow as it leaves the bow?
jump to a height of 12.4 ft when leaving the ground at an angle of 42°. With what speed, in SI units, must the animal leave the ground to reach that height?
What is the work done by each horse if the box is moved a distance of 25m? b) What is the tension in each cable if the angle between each cable and the direction the crate moves is 15 degree?
An infinitely long line of charge has a linear charge density of 7.00×10-12 . A proton is at distance 15.0 from the line and is moving directly toward the line with speed 1700 .How close does
A ladybug is sitting at the center of a turntable. The turntable is rotating on a frictionless bearings and it rotates without assistance from a motor. As the ladybug walks to the edge of the turnta
The free end of the rope is pulled with a constant force P for a distance of 4.00 m, at which point the end of the rope is moving at 7.00 m/s. If the rope does not slip on the cylinder, what is the
A conical pendulum consists of a bob of mass m in motion in a circular path in a horizontal plane. Recall the demo in class with the bowling ball hung from the ceiling that acted as a pendulum. Duri
The average intensity of light emerging from a polarizing sheet is 0.709 W/m2, and that of the horizontally polarized light incident on the sheet is 0.981 W/m2. Determine the angle that the transmi