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A 1 300 kg car traveling initially with a speed of 25.0 m/s in an easterly direction crashes into the back of a 9 600 kg truck moving in the same direction at 20.0 m/s. The velocity of the car righ
A playground merry-go-round has a radius R and a rotational inertia I. When the merry-go-round is at rest, a child with mass m runs with speed v along a line tangent to the rim and jumps on. The ang
A convex mirror with a focal length of - 85 cm is used to give a truck driver a view behind the vehicle. If a person who is 1.7 m tall stands 2.2 m from the mirror, where is the person's image locat
(a) Assuming that the total retarding force on the diver is constant at 65.0 N with the parachute closed and constant at 3 600 N with the parachute open, what is the speed of the diver when he land
An L-R-C circuit has an inductance of 0.480 H, a capacitance of 2.60×10-5 F, and a resistance of R. A What is the angular frequency of the circuit when R=0?
Consider a disk with radius R and total charge Q. What are the electric potential and electric field at a distance z above the surface of the disk?
how far will the spring be compressed when the box's speed drops to 0?
Calculate the flux of the electric field created by the cylinder through the surface of the cube. How would you answer change if H became greater than L?
How much work is done if the same tension is directed parallel to the snow?
The weight of the block on a table is 474 N and that of the hanging block is 205 N. Ignore all frictional effects, and assuming the pulley to be massless. (a) Find the acceleration of the two blocks
Two forces on the object are F1 = 3.2 at 80 below the +x-axis and F2 = 3.2 at 40 above the -x-axis. Is there a third force on the object? Why or why not? What is the magnitude of the third force? Fi
A neodymium-glass laser emits short pulses of high-intensity electromagnetic waves. The electric field of such a wave has an rms value of Erms = 2.8 x 109 N/C. Find the average power of each pulse t
When a 50-gram piece of aluminum at 100 degrees celsius is placed in water, it loses 735 calories of heat while cooling to 30 degrees celsius. Calculate the specific heat capacity of the aluminum.
A long pair of wires conducts 23.7 A of dc current to, and from, an instrument. If the insulated wires are of negligible diameter but are 2.8 mm apart, what is the magnetic field d = 11.6 cm from th
Calculate iron's temperature changes when a 30-gram piece of iron is dropped into a container of water and gives off 165 calories in cooling. Can you show this using a formula with mass, calories an
A wire forms a semicircle of radius R = 7.10 cm and two (radial) straight segments each of length L = 13.1 cm. The wire carries current i = 48.0 mA. What is the magnitude and direction of the net ma
The bungee cord has an unstretched length of 27.0 m. To be safe, the bungee cord should stop George's fall when he is at least 2.00 m above the river. If George has a mass of 75.0 kg, what is the mi
Capacitor A with a capacitance Capacitor A= 35 uF is fully charged by a battery to a potential difference of 12 V and then disconnected from the battery. After that, capacitor A is connected to an u
A 4.50 x 102 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.70 x 104J of work on the balloon in the proce
Your mass is m = 59 kg. Neglect frictional forces between the raft and the water. how far from the end of the pier is the center of mass of the you-raft system?
A submerged scuba diver looks up towards the calm surface of a freshwater lake and notes that the sun appears to be 35 degrees from the vertical. The diver's friend is standing on the shore of the l
An object with a height of 46 cm is placed 2.4 m in front of a concave mirror with a focal length of .5 m. Find the magnification of the image produced by the mirror.
What is the minimum height the mirror must have for you to be able to see the top of the table in the mirror?
The reflecting surfaces of two mirrors form a vertex with an angle of 120 degrees. If a ray of light strikes mirror 1 with an angle of incidence of 55 degrees, find the angle of reflection of the ra
A 247 kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0° with respect to the horizontal.