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Where should a parent push with a force of 185 N in order to hold the teeter totter level? Where should the parent push with a force of 363 N to keep the teeter totter level?
A rifle bullet with a mass of 15.5 g traveling toward the right at 256 m/s strikes a large bag of sand and penetrates it to a depth of 21.4 cm. Determine the magnitude and direction of the friction
The force exerted by the wind on the sails of a sailboat is Fsail = 370 N north. The water exerts a force of Fkeel = 190 N east. If the boat (including its crew) has a mass of 300 kg, what are the
Resistances of 1.6 ohm, 4.2 ohm, and 6 ohm and a 16.3 V battery are all in series. Find the potential difference across the first (1.6) resistor. Answer in units of V.
If the magnitude of the instantaneous velocity at t1 is v1 = 3 m/s, what is the instantaneous velocity v2 at time t2?
A supermarket employee pushes cart 1 (with mass m1) horizontally with a force of magnitude F = 851 N. Assume there is no friction anywhere. a) Find the magnitude of the acceleration of the carts.
A pilot claims to have seen a UFO moving initially at a speed of about 429 m/s in an easterly direction and then, in a time interval of only 1.0 s, turning 44°of east and moving at 429 m/s. Com
A 9.0 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.63 T pointing up. During the course of 0.30 s, the field is changed to one of 0.25 T po
Two particles of different mass start from rest. The same net force acts on both of them as they move over equal distances. How do their final kinetic energies compare?
A submarine is 305 m horizontally out from the shore and 117 m beneath the surface of the water. A laser beam is sent from the submarine so that it strikes the surface of the water at a point 219 m
A krypton laser produces a cylindrical red laser beam 2.0mm in diameter with 2.0W of power. What is the light intensity on a wall 0.80m away from the laser?
For the motion from the initial release until the piece of wood comes to rest, what is the total amount of work done by friction?
A 16 kg loudspeaker is suspended 2.5 m below the ceiling by two cables that are each 60 degrees from vertical. What is the tension in the cables?
A 0.26 kg rock is thrown vertically upward from the top of a cliff that is 32 m high. When it hits the ground at the base of the cliff, the rock has a speed of 29 m/s. Assuming that air resistance
What is the speed of the block immediately after the bullet stops relative to it?
A thin radioactive source placed in an ionization chamber emits 10^6 alpha particles per second with energy 3.81 MeV. the particles are completely stopped in the gas, for which W=36 ev ip^-1. Calcu
A staging that weighs 430 N supports two painters, one 110 N and the other 460 N. The reading in the left scale is Ft = 700 N. What is the reading Fr, in the right hand scale?
What is the magnitude of the normal force exerted on the car by the walls of the cylinder at point A (at the bottom of the vertical circle)?
What is the minimum current in the rod that will cause it to float in a horizontal magnetic field of 1.70972 T?
Speedboat A negotiates a curve whose radius is 160 m. Speedboat B negotiates a curve whose radius is 180 m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the s
what is the probability that an electron energy state in Ge will be occupied at temperature T=300 K if the energy state is greater than the Fermi energy by 2 eV? Repeat the calculations for T=77 K.
A beam of alpha particles produced a current of 10^-14 A in a parallel-plate ionization chamber for 8 s. The chamber contained air at STP (36 ev ip^-1). If the chamber volume was 240 cm^3, what was
A 75.0kg man is riding in a shopping mall. The escalator moves the man at constant velocity from ground level to the floor above, a vertical height of 4.60m. What is the work done on the man by the
A man pushes a lawn mower on a level lawn with a force of 200 N. If 42% of the force is directed horizontally, how much work is done by the man in pushing the mower 4.8 m?
A 300 g block on a 54 -long string swings in a circle on a horizontal, frictionless table at 75. What is the speed of the block? What is the tension in the string?