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An attack helicopter is equipped with a 20- mm cannon that fires 57 g shells in the forward direction with a muzzle speed of 1130 m/s. The fully loaded helicopter has a mass of 3490 kg. A burst of 2
When identical amounts of heat are supplied to each, the glass bar reaches a temperature of 96 °C, while the other bar reaches 257.0 °C. What is the specific heat capacity of the other subst
A 59-kg woman and a 73-kg man sit on a seesaw, 3.5 m long. Where is their center of mass? Neglect the mass of the seesaw.
The coefficient of friction between the skis and the snow is 0.16. After the skier had been moving for 5.0 s, the friction of the snow suddenly increased and made the net force on the skier zero. Wh
A projectile is fired at an upward angle of 45° from the top of a 279 m cliff with a speed of 204 m/s. What will be its speed when it strikes the ground below? (Use conservation of energy.)
At 1.15s after liftoff, the rocket clears the top of its launch platform, 63m above the ground. After an additional 4.75s it is 1.00km above the ground. calculate the magnitude of the average veloci
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?