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An intergalactic rock star bangs his drum every 1.50 s. A person on earth measures that the time between beats is 2.10 s. How fast is the rock star moving relative to the earth?
A girl delivering newspapers travels 5 blocks west, 6 blocks north, then 9 blocks east. What is the magnitude of her resultant dis- placement?
A(n) 0.55 kg softball is pitched at a speed of 18 m/s. The batter hits it back directly at the pitcher at a speed of 25 m/s. The bat acts on the ball for 0.018 s. What is the magnitude of the avera
A 2.5 syringe has an inner diameter of 5.0mm , a needle inner diameter of 0.28mm , and a plunger pad diameter (where you place your finger) of 1.2cm . A nurse uses the syringe to inject medicine in
A 76 g, 35-{rm cm}-long rod hangs vertically on a frictionless, horizontal axle passing through its center. A 10 g ball of clay traveling horizontally at 2.4 m/s hits and sticks to the very bottom t
A solid spherical conductor has a radius of 15 cm. the electric field 30cm from the center of the sphere has a magnitude of 800N/C. what is the surface charge density on the sphere?
If the dog is pulling the leash at 60 N one way, at what force should Jillian pull on the leash in that same direction to obtain and maintain static equilibrium?
During the initial stage of construction, the beam is not to be bolted to the wall, but to be held in place solely by friction. What is the minimum coefficient of friction between the beam and the w
Two brothers, Jimmy and Robbie, sit 3.00 m apart on a horizontal seesaw with its fulcrum exactly midway between them. Jimmy sits on the left side, and his mass is 42.5 kg. Robbie's mass is 37.0 kg.
A child and sled with a combined mass of 50.0 kg slide down a frictionless hill that is 7.34 m high. If the sled starts from rest, what is its speed at the bottom of the hill?
The bullet passes right through and emerges on the other side with a speed of 100 m/s, and the saxophone is given a speed of 4 m/s. Find the initial speed of the bullet.
A uniform plank of length 4.5 m and weight 205 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x can a person who we
At t = 0, a 726g mass at rest on the end of a horizontal spring (k = 115N/m) is struck by a hammer, which gives it an initial speed of 2.58m/s. Determine the period of the motion.
A mass of 1.70 kg stretches a vertical spring 0.315 m. If the spring is stretched an additional 0.134 m and released, how long does it take to reach the (new) equilibrium position again?
over a horizontal surface at a constant speed. The coefficient of friction between the sled and the snow is 0.236.The acceleration of gravity is 9.8 m/s2 . Find the work done by the dogs.
You know that if you plug in too many appliances you will overload the circuit breaker. The toaster label says that its power output is 700 watts.
When the wood cube attains hydrostatic equilibrium again, what will be the distance from the top of the liquid to the bottom face of the cube?
A handball of mass 300 g is thrown straight against a wall with a speed of 8 m/s. It rebounds with the same speed. (a) What impulse is delivered to the wall?
Drawing on Eratosthenes method, if two observers are due north and south of each other and are separated by 400 km, what is the circumference of their spherical world if they see the same star on t
Light is incident upon the the surface of water in a level, flat-bottomed glass dish at an angle of 50 degrees to the normal. At What angle will the light emerge from the bottom of the dish? The re
A spherical steel ball bearing has a diameter of 2.540 cm at 24°C. (a) What is the diameter when its temperature is raised to 82°C?
A crate of mass m = 27 kg rides on the bed of a truck attached by a cord to the back of the cab as in the figure. The cord can withstand a maximum tension of 53 N before breaking. Neglecting fricti
In an American football game, a 89.3 kg fullback running east with a speed of 5.09 m/s is tackled by a 95.8 kg opponent running north with a speed of 3.01 m/s. (a) If the collision is perfectly inel
You are driving to the grocery store at 19 . You are 150 from an intersection when the traffic light turns red. Assume that your reaction time is 0.80 and that your car brakes with constant acceler
Bob, who has a mass of 87 kg , can throw a 500g rock with a speed of 35m/s. The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.1m. What