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A child pushes a merry-go-round from rest to a final angular speed of 0.50 rev/s with constant angular accelaration.In doing so,the child pushes the merry-go-round 2.0 revolutions.What is the angul
A hawk flies in a horizontal arc of radius 12.9 m at a constant speed of 4 m/s. It then increases it's speed at the rate of 1.55 m/s2. Find the magnitude of acceleration under these new conditions.
A student makes a simple generator by using a single square loop 24 cm on each side. The loop is then rotated at a frequency of 60 Hz in a magnetic field of 0.044 T. What is the maximum emf output?
Your reaction time before stepping on the brakes is 0.50 , and the maximum deceleration of your car is 12 . How much distance is between you and the deer when you come to a stop? What is the maximum
A 4.0 syringe has an inner diameter of 6.0 , a needle inner diameter of 0.27 , and a plunger pad diameter (where you place your finger) of 1.2 . A nurse uses the syringe to inject medicine into a p
A ceiling fan with 84cm diameter blades is turning at 61rpm. Suppose the fan coasts to a stop 25 after being turned off. What is the speed of the tip of a blade 10 s after the fan is turned off?
A 7.0 kg bowling ball moves at 2.25 m/s. How fast must a 2.00 g Ping-Pong ball move so that the two balls have the same kinetic energy?
In the afternoon, the decibel level of a busy freeway is 80 dB with 100 cars passing a given minute. Late at night, the traffic flow is only 5 cars per minute. What is the late-night decibel level?
A thin 320 g disk with a diameter of 5.20 cm rotates about an axis through its center with 0.705 J of kinetic energy. What is the speed (in m/s) of a point on the rim?
A 2.0 {rm kg} wood block is launched up a wooden ramp that is inclined at a 35 degree angle. The block's initial speed is 10 {rm m/s}. What vertical height does the block reach above its starting po
A 90-kg firefighter slides down a fire pole. The average frictional force exerted on him by the pole has a magnitude of 795 N, and his speed at the bottom of the pole is 3.8 m/s. How far did he slid
When a clean surface of Sodium metal is exposed to blue light l = 486 nm, electrons are emitted. If the work function is 2.26 ev , What is the Kinetic energy of the emitted electrons?
A glass windowpane in a home is 0.62 cm thick and has dimensions of 0.9 m multiplied by 1.6 m. On a certain day, the indoor temperature is 20°C and the outdoor temperature is 0°C. What is th
A metal rod of length L=3.0m is free to rotate about a frictionless hinge at one end. The rod is initially at rest and oriented horizontally and then released so that it swings to the bottom. (a) Wh
A 5.5 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 2.4 m/s2, find the force exerted by the rope on the bucket.
A soccer ball of diameter 32.0 cm rolls without slipping at a linear speed of 2.73 m/s. Through how many revolutions has the soccer ball turned as it moves a linear distance of 19.4 m?
A container of hot water at 80 C cools to 79 C in 15 seconds when it is placed in a room that is at 20 C. Use Newton's law of cooling.
A cylindrical container 1.7 {rm m} tall contains mercury to a certain depth, d. The rest of the cylinder is filled with water. If the pressure at the bottom of the cylinder is two atmospheres, what
The bullet passes through the block and emerges with its speed reduced to 100 m/s. The block slides a distance of 0.10 m along the surface from its initial position. (a) What is the coefficient of k
After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. What is their speed at the bottom of the hill
A 0.75 kg rock is projected from the edge of the top of a building with an initial velocity of 10.2 m/s at an angle 40? above the horizontal. The building is 7.12 m in height. At what horizontal dis
Determine the identity of a cube of metal that measures 1.2 cm on each side and has a mass of 15.4g.
A vertical spring has a stiffness of 2000 N/m. One of its ends is attached to the floor, and the other extends up a distance of 0.4 m when it is unstretched. A block of 3 kg is carefully placed on