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A 25.0 kg loudspeaker is suspended 1.80 m below the ceiling by two 3.50 m long cables that angle outward at equal angles. What is the tension in each of the cables?
A spool of thin wire (with inner radius r = 0.50 m, outer radius R = 0.65 m, and moment of inertia I_cm = 1.1323 kg*m2) pivots on a shaft. The wire is pulled down by a mass M = 1.450 kg. After falli
A rifle is aimed horizontally at a target 55.0 m away. The bullet hits the target 1.50 cm below the aim point. What is the bullets flight time? What is the bullets speed as it left the barrel?
An airplane flies at airspeed (relative to the air) of 170 km/h. The pilot wishes to fly due North (relative to the ground) but there is a 77 km/h wind blowing Southwest (direction 225 clockwise fr
What is the bubble's diameter just as it reaches the surface of the lake, where the water temperature is 20.0C? Assume that the air bubble is always in thermal equilibrium with the surrounding water
The car encounters a loop of radius = 16.0 at ground level, as shown. As you will learn in the course of this problem, the initial height 48.0 is great enough so that the car never loses contact wi
Determine the (a) smallest, (b) second smallest, (c) third smallest (occurs twice), and (d) fourth smallest distance between the object and image of the object.
A box of mass 11 kg is at rest on a horizontal frictionless surface. A constant horizontal force then acts on the box, and accelerates it to the right. It is observed that it takes the box 6.5 secon
Two identical cars capable of accelerating at 3.50 are racing on a straight track with running starts. Car A has an initial speed of 2.70 ; car B starts with speed of 4.90. What is the separation of
A subway train accelerates from rest at one station at a rate of 1.30 m/s^2 for half the distance to the next station, then decelerates at this same rate for the second half of the distance. If the
Susan's 12.0 kg baby brother Paul sits on a mat. Susan pulls the mat across the floor using a rope that is angled 30 degrees above the floor. The tension is a constant 30.0 N and the coefficient of
A 15 g piece of Styrofoam carries a net charge of -0.5 μC and floats above the center of a very large horizontal sheet of plastic that has a uniform charge density on its surface.
A centrifuge is a common laboratory instrument that separates components of differing densities in solution. How many revolutions did the centrifuge complete after being turned off?
A car starts from rest on a curve with a radius of 110 and accelerates at 0.500 . How many revolutions will the car have gone through when the magnitude of its total acceleration is 3.50 ?
The same elevated temperature, 50°C. You now plop (yes, plop) them down in a dark, much cooler room. Which object will reach the room's temperature first?
A heavy piece of hanging sculpture is suspended by a 90-cm-long, 5.0 g steel wire. When the wind blows hard, the wire hums at its fundamental frequency of 80 Hz. What is the mass of the sculpture?
The potter can stop the wheel in 7.0 s by pressing a wet rag against the rim and exerting a radially inward force of 68 N. Find the effective coefficient of kinetic friction between the wheel and th
What is the magnitude of the impulse delivered to the ball?
A 40 kg child is in a swing that is attached to a rope 2m long. Find potential energy associated with the child relative to his lowest point when the ropes are horizontal.
Children in a tree house lift a small dog in a basket 3.50 m up to their house. If it takes 219 J of work to do this, what is the combined mass of the dog and basket?
A 100-m-long train accelerates uniformly from rest. If the front of the train passes a railway worker 166 m down the track at a speed of 21 m/s, what will be the speed of the last car as it passes t
Where is the center of mass of the system formed by these four objects?
A mass m1 on a horizontal shelf is attached by a thin string that passes over a frictionless pulley to a 2.6 kg mass (m2) that hangs over the side of the shelf 1.6 m above the ground.
A 1405-kg car moving north at 27.0 m/s is struck by a 2165-kg car moving east at 12.0 m/s. The cars are stuck together. How fast and in what direction do they move immediately after the collision?
A 44 resistor can dissipate up to 0.26 W of power without burning up. What is the smallest number of such resistors that can be connected in series across a 9.0 V battery without any one of them bur