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A copper rod is fastened securely at both ends to immovable supports. When this rod is stretched, it will rupture when a tensile stress of 1.65 x 107 N/m2 is applied at each end. The rod just fits between the supports, so initially there is no stress applied to the rod. The rod is then cooled. What is the magnitude |?T| of the change in temperature of the rod when it ruptures?
A 768 kg car moving at 27 m/s brakes to a stop. The brakes contain about 16 kg of iron that absorb the energy. What is increase in temperature of the brakes
you accelerate your car starting from rest. while the car is increasing its speed, the frictional force acting from the road on the tires? A) directed backword, opposing the motion B)IS directed vertically uo, C) is directed forward, in the direct..
Three resistors, 28, 48, and 80 ?, are connected in series, and a 0.53-A current passes through them, What is the equivalent resistance
What is this flux expressed as a fraction of the energy flux due to thermal re-radiation of absorbed solar energy. If radioactive decay were the only heat source for the Earth, what would the Earth's surface temperature be.
A solid disk rotates in the horizontal plane at an angular velocity of 0.036 rad/s with respect to an axis perpendicular to the disk at its center, what is the angular velocity of the disk
A 130-g baseball, moving along the x-axis with speed 29.0 m/s strikes a fence at a 45 degree angle and rebounds along the y-axis with unchanged speed. Give x and y components of its change in momentum.
An object undergoing simple harmonic motion takes 0.34 s to travel from one point of zero velocity to the next such point. The distance between those points is 40 cm. Calculate the frequency of the motion
A copper vat is 12 m long at room temperature (20 degrees Celsius). How much longer is it as it contains boiling water at 1 atm pressure.
An unstable atomic nucleus of mass 1.60 10-26 kg initially at rest disintegrates into three particles. One of the particles, of mass 5.02 10-27 kg, Find the total kinetic energy increase in the process
Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 22 m/s at an angle 63 degrees, What is the horizontal and vertical component of the balls
An electron and a proton, starting from rest, are accelerated through an electric potential difference of the same magnitude. In the process, Find the ratio ve/vp
An emf is induced in a conducting loop of wire 1.16 m long as its shape is changed from square to circular.
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