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Inside the cylinders of a diesel engine, the mixture of fuel and air is compressed to about 1/20 of its original volume. Though diesel engines have no spark plugs to ignite this mixture, it ignites anyway because...
1) diesel fuel and air ignite at room temperature
2) increases in temperature decreases molecular motion.
3) change in temperature is controlled by the cooling system
4) rapid increase in volume raise the temperature of the mixture
5) rapid increases in volume raise the temperature of the mixture.
A worker pushed a 22 kg block 8.1 m along a level floor at constant speed with a force directed 39° below the horizontal. find the increase in thermal energy of the block-floor system
An automobile has mass 990 kg (including passengers). It is pushed down by 1.9 cm for every additional 100 kg of passengers. Find the amplitude of oscillation of the automobile
a charge of q is located at the origin while an identical charge is located on the x axis at x 0.60 m. a third charge
A cat dozes on a stationary merry-go-round, at a radius of5.5m from the center of the ride. Then the operator turns on the ride and brings it up to its proper turning rate of one complete rotation every6.0s.
Turning a doorknob through 0.40 of a revolution requires 0.12 of work. What is the torque required to turn the doorknob?
A light ray of λ = 410 nmenters at an angle of incidence of 37.6o from air into ablock of plastic. What is the speed of the light inside the plastic
A 0.0500 kg cube of ice at an initial temperature of-15.0oC is placed in 0.600 kg of water at T =45.0oC in an insulated container of negligible mass. Calculate the change in entropy of the system
A line of positive charge is formed into a semicircle of radiusR. The charge per unit length along the semicircle isdescribed by the expressionλ=λ0/θcosθ. Calculate theelectric field at the center of the curvature.
A discus thrower changes his angular velocity from 280°/s to 400°/s (at the time of release) in 1.5 sec. find the average angular and linear acceleration
A rope goes over a circular pulley with a radius of 7.5 cm. If the pulley makes four revolutions without the rope slipping, what length of rope passes over the pulley
A64-kg astronaut is in space, far from any objects that would exert a significant gravitational force on him. How fast is the astronaut moving after he throws the mallet
consider a collection of three point charges. two equal charges q1 q2 3.0 nc are on the x-axis at the points x 4.0 cm
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