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Sam is using a rope to pull a box weighing 300 N across a floor with constant velocity. The rope makes an angle of 300 above the horizontal. If the tension in the rope is 100 N what is the normal f
A major-league catcher gloves a 94 mi/h pitch and brings it to rest in 0.17 m. If the force exerted by the catcher is 803 N, what is the mass of the ball?
An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s after traveling 90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force
A uniform block of height 0.200m, floats in glycerin of density 1260kg/m3. The bottom of the block is 0.1690m below the surface of the glycerin. What is the density of the block?
Compute the coefficient of linear expansion of a 60 cm metal rod that expands by 1.02 mm when the temperature rises by 100 degree celsius.
A dentist uses a small mirror of radius 37 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 10 mm from the tooth, what is the magnification of the image?
A 0.140-kg baseball is pitched a 45 m/s. The batter hits it horizontally to the pitcher at 60 m/s. Find the change in momentum
A 43-N child is in a swing that is attached to ropes 1.6 m long. Find the gravitational potential energy associated with the child relative to her lowest position at the following times.
The potential energy of the system is zero at the equilibrium position and has a maximum value of 50 J. When the displacement of the block is half the minimum value its instantaneous kinetic energy
The cart is released from rest, allowing it to roll, pulled by the falling hanger. What is the formula for the acceleration a of the cart in terms of the cart's mass M, the hanger's mass m, and the
A dentist uses a small mirror of radius 42 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 15 mm from the tooth, what is the magnification of the image?
(a) Calculate the heat per second per square meter that is conducted through the ice-aluminum combination. (b) Calculate the heat per second per square meter that would be conducted through the alum
A car traveling at 30.0 m/s undergoes a constant negative acceleration of magnitude 2.00 m/s2 when the brakes are applied. How many revolutions does each tire make before the car comes to a stop, as
A river flows due east at 1.00 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 11.0 m/s due north relative to the water. If the river is 3
What is the maximum weight that a "massless" balloon filled with 1.00 meters cubed of helium can lift into the air? Assuming that the density of air is 1.20 kg/m cubed and that of helium is o.177 k
A 200 {rm kg} weather rocket is loaded with 100 {rm kg} of fuel and fired straight up. It accelerates upward at 34 {rm m/s^2} for 32 s, then runs out of fuel. Ignore any air resistance effects. Wha
A handball of mass 0.10 kg, traveling horizontally at 30. m/s, strikes a wall and rebounds at 24 m/s. What is the change in the momentum of the ball?
Space invaders land on earth. On the invaders' temperature scale, the ice point is at 25 °I (I = invader), and the steam point is at 156 °I. The invaders' thermometer shows the temperature o
A 1.00 x 10^3 kg sports car accelerates from rest to 25.0 m/s in 7.50 s. What is the average power output of the automobile engine?
What is the safe's coefficient of kinetic friction on the bank floor?
A warehouse worker want to push a 30kg box up a loading ramp. the coefficient of kinetic friction between the ramp is 0.28, if the ramp is incliend at 20, determine the applied force required to mai
The current in a solenoid with 21 turns per centimeter is 0.50 . The solenoid has a radius of 1.6 . A long, straight wire runs along the axis of the solenoid, carrying a current of 15. Find the magn
A flywheel with initial angular velocity of 120 rad/s comes to rest after undergoing 200 revolutions. Find the constant angular acceleration
Two ideal gases have the same mass density and the same absolute pressure. One of the gases is helium (He), and its temperature is 180 K. The other gas is neon (Ne). What is the temperature of the n
The model airplane in figure below is flying at a speed of 23 m/s on a horizontal circle of radius 17 m. The mass of the plane is 0.96 kg. The person holding the guideline pulls it in until the rad