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Pull horizontally on a crate with a force of 140 N and it slides across the floor in a dynamic equilibrium. How much friction is acting on the crate?
A 2.60 kg steel ball strikes a wall with a speed of 10.0 m/s at an angle of 60.0° with the surface. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.19
An unstable high-energy particle is created in the laboratory, and it moves at a speed of 0.976c. What is the distance measured by a hypothetical person traveling with the particle?
An 8.00-kg point mass and a 14.0-kg point mass are held in place 50.0 cm apart. A particle of mass m is released from a point between the two masses 12.0 cm from the 8.00-kg mass along t
A boy runs 14.1 blocks north, 13.3 blocks northeast, and 15.3 blocks west. Determine the length of the displacement vector that goes from the starting point to his final position.
Explain refraction in terms of a change of wave speed in different media
A 63 kg trampoline artist jumps vertically upward from the top of a platform with a speed of 4.8 m/s. If the trampoline behaves like a spring of spring constant 6.2×104 N/m, how far does
A uniform 1.3-kg rod that is 0.80 m long is suspended at rest from the ceiling by two springs, one at each end of the rod. Both springs hang straight down from the ceiling. The springs have identic
A 6.40 g lead bullet traveling at 460 m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet while the other half i
A motorist traveling at 18 m/s encounters a deer in the road 48 m ahead. If the maximum acceleration the vehicle's brakes are capable of is -6m/s^2 what is the maximum reaction time of the motorist
A 1.00 kg ball strikes a wall with a velocity of 8.0 m/s to the left. The ball bounces off with a velocity of 3.5 m/s to the right. If the ball is in contact with the wall for 0.25 s, what is the c
A speedboat starts from rest and accelerates at +2.01 m/s2 for 7.20 s. At the end of this time, the boat continues for an additional 6.40 s. Find the total displacement of the boat.
What was the power output of the speaker, assuming uniform spherical spreading of the sound and neglecting absorption in the air?
A ball is thrown upward from a bridge with a speed of 48 ft/s. Find how long the ball rises, how high it goes, how long it is in the air, and its velocity when it strikes the water?
A uniform solid flywheel of radius 1.4 m and mass 15 kg rotates at 2.4 rad/s. What is the magnitude of the flywheel's angular momentum in kg.m^2/s
A falling skydiver has a mass of 54.5 kg. What is the magnitude of the skydiver's acceleration when the upward force of air resistance has a magnitude that is equal to one-fourth of his weight?
The lead increases by an amount change of temperature. For an individual bullet hitting the plate with twice the speed, what is the best estimate of the temperature increase?
An airplane is flying horizontally with a speed of 1000km/h(280m/s) when an engine falls off. Neglecting air resistance,assume it takes 30s for the engine to hit the ground. Show that the altitude o
A cardinal (Richmondena cardinalis) of mass 4.30×10-2 and a baseball of mass 0.143 have the same kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of
The collision excites the atom from its ground state () to a state with an energy of 3.40. What is the speed of the electron after the collision?
To keep from falling, you slide your right foot out toward the rear of the train. Explain in terms of torque how this actions keeps you from falling over.
A soccer player applies a force of 60.5 N to a soccer ball while kicking it. If the ball has a mass of 0.42 kg, what is the acceleration of the soccer ball?
The lantent heat of fusion for ice is 80 Cal/g and the specific heat of water is 1.0 cal/g/c. how much heat will the ice have yo absorb from the water to melt the ice?
A certain string just breaks when it is under 25 N of tension. A boy uses this string to whirl a 0.75-kg stone in a horizontal circle of radius 2.0 m. The boy continuously increases the speed of th
A crane lifts a 425 kg steel beam vertically upward a distance of 78 m. How much work does the crane do on the beam if the beam accelerates upward at 1.8 m/s^2? Neglect frictional forces.