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You are driving to the grocery store at 26 m/s. You are 105 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.50 s and that your car brakes with constant a
The moon revolves around the earth, making a complete revolution in 27.3 days. Assume that the orbit is circular and has a radius of 239,000 miles. What is the magnitude of the centripetal accelera
What is the volume of 3.25 moles of a gas at a temperature of 115 K and a pressure of 275 kPa?
A 2.0 x 10^3 car starts from rest at the top of a driveway 5.0 meters long that slopes at 20.0 degrees with the horizontal. If an average force of 4.0 x 10^3 N impedes the motion, what is the speed
When an 89.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 1.80 x 103 J. By how much does the potential energy of a 18.0
A loudspeaker of mass 21.0 is suspended a distance of = 2.20 below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of = 3.30 .
Using Newton's laws, calculate , the magnitude of the normal force that the floor exerts on the chair.
A 2.50 g bullet, traveling at a speed of 395 m/s, strikes the wooden block of a ballistic pendulum, such as that in the figure below. The block has a mass of 265 g. How high does the combination ri
What is the acceleration of two falling sky divers (mass 113.0 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight?
The spring constant for the tendon is the same for both groups, 33 N/mm. What is the difference in maximum stored energy between the sprinters and the nonathletes?
A rifle with a barrel length of 64 cm fires a 9 g bullet with a horizontal speed of 450 {rm m/s}. The bullet strikes a block of wood and penetrates to a depth of 12 cm.
A 13 g bullet traveling 236 m/s penetrates a 2.0 kg block of wood and emerges cleanly at 179 m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bull
Determine the work done by (a) the force F (b) gravity (c) the normal force between the block and the wall
What is the potential energy for the child just as she is released, compared with the potential energy at the bottom of the swing?
The first-order bright fringe is a distance of 4.84 mm from the center of the central bright fringe. For what wavelength of light will the first-order dark fringe be observed at this same point on the
A pendulum is 0.80 m long and the bob has a mass of 1.0 kg. At the bottom of its swing, the bob"s speed is 1.6 m/s. A) What is the tension in the string at the bottom of the swing? B) Explain why th
Both teenagers pull with a force of 55 at an angle of 35 relative to the forward direction, which is the direction of motion. In addition, the snow exerts a retarding force on the sled that points o
A dog searching for a bone walks 3.50 m south, then 8.20 m at an angle of 30.0° north of east, and finally 15.0 m west. Use graphical techniques to find the direction of the dog's resultant disp
How fast (in rpm) must a centrifuge rotate if a particle 9.0 from the axis of rotation is to experience an acceleration of 125,000 g's?
A 64 kg hiker climbs to the top of a 3600 m-high mountain. The climb is made in 5.0 h starting at an elevation of 2500 m. a) Calculate the work done by the hiker against gravity.
A speeding motorist traveling 135 km/h passes a stationary police officer. The officer immediately begins pursuit at a constant acceleration of 10.0 km/h/s (note the mixed units).
Consider a system consisting of 2.0 mol of carbon dioxide gas, initially at 25C and 10 atm and confined to a cylinder of cross section 10.0 cm2. It is allowed to expand adiabatically against an exte
What is the minimum length of a string whose fundamental frequency is 272 Hz? The speed of sound at this temperature is 340 m/s.
A 5500 kg helicopter accelerates upward at 0.50 m/s^2 while liftinga 1200kg car. A. what is the lift orce exerted on the air by the rotors?
Estimate the force a person must exert on a string attached to a 0.130 kg ball to make the ball revolve in a horizontal circle of radious 0.600 m. The ball makes 1.60 revolutions per second.