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Question1
A dockworker applies a constant horizontal force of 76.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 13.0m in a time 5.30s
a. What is mass of the block of ice?
b. If worker stops pushing at the end of 5.30s, how far does block move in the next 5.80s?
Question2
The radius of Venus (from the center to just above the atmosphere) is 6050 km (6050103 m), and its mass is 4.91024 kg. An object is launched directly up from just above the atmosphere of Venus.
(a) What initial speed is necessary so that when the object is far from Venus its final speed is 7000 m/s?
(b) What initial speed is essential so that when the object is far from Venus its final speed is 0 m/s? (This is called the "escape speed.")
Suppose a neutron, traveling to the right at 1000 m/s, strikes a proton moving upward at 500 m/s. Find the magnitude and direction of the deuteron velocity vector
A 3.0-cm-diameter parallel-plate capacitor with a spacing of 0.300 mm is charged to 500 V. What is the total energy stored in the electric field
The function y(x, t) = (25.0 cm) cos(?x - 26?t), with x in meters and t in seconds, describes a wave on a taut string. What is the transverse speed for a point on the string at an instant
An elderly sailor is shipwrecked on a desert island, but manages to save his eyeglasses. What is the magnifying power of the telescope he can construct with these lenses
What should be the least kinetic energy in electron volts
Lonnie pitches a baseball of mass .20 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60-m/s. If the bat is in contact with the ball for .050 s, what is the impulse experienced..
Dust particles are pulverized rock, which has density 2500 kg/m3. They are approximately spheres 20 ?m in diameter. what is the root-mean-square speed (thermal speed) of a dust particle at 60°C
Two unequal point charges q1 and q2 are held in place unconnected from each other. A point charge Q is placed somewhere between them at a point where it remains stationary when free. From this observation, we can conclude that q1 and q2 must eithe..
define the hazards for astronauts inside any spacecraft moving in the vicinity of a pulsar.
Estimate the rms electric field in the sunlight that hits Saturn, knowing that the Earth receives about 1350 W/m2
compute the force exerted by the man, the work done by the man on the piano, the work done by the friction force, the work done by the force of gravity, and the net work done on the piano.
A 75-W, 120-V bulb is connected in parallel with a35-W, 120-V bulb. What is the net resistance
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