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A student pulls a rolling book bag by its handle. If the force used is 10 N and the handle makes an angle of 30 degrees to the horizontal, what is the work done by the pulling force after the stude
A throttle setting to give a constant speed of 1.77 m/s relative to the water. What is the magnitude of the speed of the boat relative to a stationary shore observer?
A crate of 31.2- tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it and observe that the crate just begins to move when your force exceeds 345 . After that yo
A 4.0 kg ball with a velocity of 7 m/s in the -x direction collides head on elastically with a stationary 6.0 kg ball. What are the velocities of the balls after the collision?
A 13.0 g rubber bullet hits a wall with a speed of 100 m/s. If the bullet bounces straight back with a speed of 92 m/s, what is the change in momentum of the bullet?
A potter's wheel having a radius 0.55 m and a moment of inertia 13.3 kg·m2 is rotating freely at 50 rev/min. The potter can stop the wheel in 4.5 s by pressing a wet rag against the rim and e
Suppose the opening in the tank shown below is a height h1 above the base and the liquid surface is a height h2 above the base. The tank rests on level ground.
Then in a direction 54.0° east of due north for 12.0 min, and then west for 53.0 min. What is the average velocity of the train during this run?
Calculate the total amount of heat needed to raise the temperature of 15.7 grams of ice from -10C to 75C
Two towers have heights of 420 m and 565 m. If objects were dropped from the top of each, what would be the difference in the time it takes the objects to reach the ground?
A child bounces a 48 g superball on the sidewalk. The velocity change of the superball is from 28 m/s downward to 17 m/s upward. If the contact time with the sidewalk is 1/800 s, what is the magnit
A baseball is hit with a speed of 30.0 at an angle of 50.0. It lands on the flat roof of a 14.0 -tall nearby building.If the ball was hit when it was 1.1 above the ground, what horizontal distance
Since even the nearest stars are trillions of miles away, if a radio message were sent to us by an extraterrestrial civilization, it would take _____years for it to travel from one of the nearest s
A professional race-car driver buys a car that can accelerate at 89.0 m/s2. Find the velocities of both cars at the instant they are side by side.
What is happening to the average kinetic energy of the molecules during the five minutes in which the temperature of the water was being recorded? Explain your answer.
You're carrying a 3.4-m-long, 20 pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 from its tip.
What is the energy of a photon that has the same wavelength asa 12-eV electron? (h=6.63 x 10-34 J * s)
Calculate how thick an absorber needs to be to absorb 75% of the incoming light using the lambert-beer law for absorption. how is the small gain coefficient k of a laser defined in relation to the
While a roofer is working on a roof that slants at 42.0above the horizontal, he accidentally nudges his 93.0 toolbox, causing it to start sliding downward, starting from rest.
A motorcyclist is able to ride on the vertical wall of a bowl-shaped track as shown. his weight is counteracted by the friction of the wall on the tires ( vertical arrow ). is it centripetal or cen
The water, what angle (in degrees) does the boat velocity make with the shore? How long does it take the boat to reach the child?
A microscope has a length of 32.0 cm, an eyepiece with a focal length of 4.8 cm, and an objective lens with a focal length of 0.5 cm. (Assum the observer's near point distance is 25 cm and that the
Consider a conical pendulum with an 80kg bob on a 10m wire making an angle of 50degree with the vertical. Determine the radial acceleration of the bob
A car is driven 110 km west and then 75 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?
A 715 newton man rides a roller coaster and is at the very bottom of an upward circular of radius 55.0 m. If he is moving 15.0 m/s at this point, what does he feel his weight to be (net force)?