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A fisherman and his rowboat have a combined mass of 125 kg. Standing in the motionless boat in calm water, he tosses out a 5 kg rock from the back of the boat, with a velocity of 5 m/s. What will be
Consider a transparent cylinder filled with hydrogen at room temperature. Use the Boltzmann equation to estimate the ratio of (i) the number of atoms in the first excited state relative to the groun
A particle with a charge of -2.50×10-8 C is moving with an instantaneous velocity of magnitude 40.0 km/s in the xy-plane at an angle of 50.0 degrees counterclockwise from the +x axis.
Two beetles run across flat sand, starting at the same point. Beetle 1 runs 0.53 m due east, then 0.71 m at 26o north of due east. Beetle 2 also makes two runs; the first is 1.58 m at 49o east of du
A ball weighs 2.0 N when placed on a scale. It is then thrown straight up. What is its weight at the very top of its motion? Explain.
A broken clothes drier with a mass of 128 kg is hurled from a cliff 12.6 m high with an initial velocity of 14.5 m/s, directed at an angle of 39.8° above the horizontal. a) How much work is done
The diameter of the circle in which the discus moves is about 2.26 m. If the thrower takes 1.32 s to complete one revolution, starting from rest, what will be the speed of the discus at release?
The crankshaft in a race car goes from rest to 3430 rpm in 1.75 s. What is the crankshaft's angular acceleration? How mant revolutions does it make while reaching 3430 rpm?
What is the least force that you need to apply to the door to hold it open?
What is the magnitude of the torque about the point where the beam is bolted into place?
A small grinding wheel has a moment of inertia of 5.24×10-5 kg·m2. What net torque must be applied to the wheel for its angular acceleration to be 140 rad/s2?
A 200 g, 16.6-cm-diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supply to take the disk from 2 to 1790 rpm in 7.6 s?
Starting from rest, a 12.54-cm-diameter compact disk takes 5 s to reach its operating angular velocity of 1796 rpm. Assume that the angular acceleration is constant. The disk's moment of inertia is
An electron starts from rest 5.00 cm from the center of a uniformly charged sphere of radius 3.00 cm. If the sphere carries a total charge of 1.00 10-9 C, how fast will the electron be moving when i
What is the (a) magnitude and (b) direction of the boat's velocity relative to the ground? Give the direction as the angle of the velocity from due north, positive if to the east and negative if to
A child on the boat walks from front to rear at 3.0 km/h with respect to the boat. What is the child's speed with respect to the ground?
At time t = 0, a projectile is launched from ground level. At t = 2.00 s, it is displaced d = 54 m horizontally and h = 51 m vertically above the launch point. At the instant it reaches its maximum
The coefficients of static and kinetic friction between the block and the ramp are 0.5 and 0.3 respectively. (a) Find the maximum value of the applied force F that he must exert before the block moves
A drag racer finished a quarter-mile driving in 10.0 seconds. What is her car's acceleration in meters per second squared (assuming the acceleration is constant)?
What are the values of normal stress and shear stress on a plane containing stress 2 and whose normal is at an angle of +65 degrees to the stress 1 direction?
A certain lightbulb has a tungsten filament with a resistance of 19.9 O when at 20.0°C and 138 O when hot. Assume the resistivity of tungsten varies linearly with temperature even over the large
Fernando places a 2.0 kg dictionary on a table top, the sits on top of the dictionary. Fernando has a mass of 52 kg. a) What is the normal force exerted by the tale on the dictionary.
The magnitude of impulse on the skier as he leaves the starting gate is?
A 40.0 g mass is attached to a horizontal spring with a spring constant of 5.0 N/m and released from rest with an amplitude of 25 cm. What is the velocity of the mass when it is halfway to the equil
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 2.20 × 106 N, one at an angle 14.0 degrees west of north, and the other at an angle 14.0 degrees east of north, as