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A 747 airliner reaches its takeoff speed of 175 in 35.6. What is the magnitude of its average acceleration?
A solenoid has a diameter of 5.72 cm and a length of 40 cm and uses 19-gauge (0.912-mm diameter) wires. You turn up the current through the solenoid at a steady rate from 0 A to 20 A in 200 m
The attractive electrostatic force between the point charges 5.72×10-6 and has a magnitude of 0.910 when the separation between the charges is 4.42. Find the sign and magnitude of the charge.
A gun is fired and a 50-g bullet is accelerated to a muzzle speed of 100 m/s. If the lenght of the ugn barrel is .90 m, what is the magnitued of the accelerating force?
The tortoise can run with a speed of 0.1 m/s and the hare can run with a speed of 2 m/s. They start their race at the same time, but the hare, feeling confident, stops along the way for a two minut
A 110- aluminum cylinder is removed from a liquid nitrogen bath, where it has been cooled to - 196. The cylinder is immediately placed in an insulated cup containing 90.0 of water at 15.0. What is t
You're carrying a 3.2-m-long, 25 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. How
A skier is accelerating down a 30.0degrees hill at 1.80m/s^2 What is the vertical component of her acceleration?
A massless rod of length 1m has a 2 kg mass attached to one end and a 3 kg mass attached to the other. The system rotates about a fixed axis perpendicular to the rod that passes through the rod 30
A car can decelerate at -3.40 m/s2 without skidding when coming to rest on a level road. What would be the magnitude of its deceleration if the road were inclined at 14° uphill? Assume the same
A 4.60--long, 480 steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 67.0 construction worker stands at the far end of t
A rotating cylinder about 24 km in length and 7.0 km in diameter is designed to be used as a space colony. With what angular speed must it rotate so that the residents on it will experience the same
A hockey puck moving along the +x axis at 0.44 m/s collides into another puck that is at rest. The pucks have equal mass. The first puck is deflected 37 below the +x axis and moves off at 0.35 m/s.
Suppose a small child rolls off a bed that is 0.40 m above the floor. If the floor is hardwood, the child's head is brought to rest in approximately 2.0 mm. If the floor is carpeted, this stopping d
If Wayne Gretzky shoots the puck at a speed of 90 km/h from the top of the offensive face-off circle 15.0m from the net, how long will it take to reach the net?
A canoe has a velocity of 0.54 m/s southeast relative to the earth. The canoe is on a river that is flowing at 0.52 m/s east relative to the earth. Find the magnitude of the velocity vec{v}_{rm c/r}
Two particles are fixed to an x axis: particle 1 of charge q1 = +1.8e-8 C at x = 20 cm and particle 2 of charge q2 = -3.00q1 at x = 70 cm. At what coordinate on the axis is the net electric field pr
As they approach shore, however, the water depth decreases and the waves slow down. This can result in an increase of amplitude to as much as 37 m or more.)
What is the wavelength of the sound? If the distance between the speakers continues to increase, at what separation will the sound intensity again be a maximum?
A 160-m-wide river flows due east at a uniform speed of 4.5 m/s. A boat with a speed of 7.2 m/s relative to the water leaves the south bank pointed in a direction 39o west of north. What is the (a)
Pilots can be tested for the stresses of flying highspeed jets in a whirling "human centrifuge," which takes 1.0 min to turn through 20 complete revolutions before reaching its final speed. (a) Wha
A potential difference of 81 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a pos
The atmosphere on Mars is almost all carbon dioxide (CO2), and has a pressure of about 6.9×102 Pa, much less than that of Earth. At -22°C (a warm day on Mars), what is the mass of one cub
A stone is thrown directly upward at 15.0 from ground level and feels no appreciable air resistance. Use the work-energy theorem to find how high it will be when its speed has been reduced to half o
Assuming the pressure of vapor in the kettle equals atmospheric pressure, determine the speed of effusion of vapor from the kettle's spout if the spout has a cross-sectional area of 2.00 cm2. Model