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Q. A thermos contains 155 cm3 of coffee at 85° C. To cool the coffee, you drop two 15-g ice cubes into thermos. The ice cubes are at first at 0° C and melt completely. What is the final temperature of the coffee? Treat the coffee as if it were water.
Q. Two sounds differ in intensity level by 4.62 dB. What is the ratio of the intensities of these two sounds? (Let I1 be the intensity of the first (higher) sound and I2 be the intensity of the second (lower) sound.)
Evaluate with the strength of the earth's gravity at its surface, how much weaker is gravity at a distance of 10 earth's center.
An atomic nucleus of mass 288 u moving at 405m/s emits an alpha particle of mass 4.0 u in the direction of its velocity. If the remaining nucleus slows to 360m/s, what velocity does the alpha particle have when it is emitted.
Plot the position, velocity, and acceleration of the plane throughout this time interval as a function of time, using initial position of the plane as the origin.
Imagine a "free" electron and a "free" proton held midway between the plates of a charged equivalent plate capacitor. When released, how do their accelerations and directions travel compare.
A gymnast of mass 69.0 kg hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. Use the value 9.81 for the acceleration of gravity.
A space vehicle is coasting at a constant velocity of 28.5 m/s in the +y direction relative to a space station. The pilot of the vehicle fires a RCS (reaction control system) thruster, which causes it to accelerate at 0.523 m/s2 in the +x direction.
Determine the angular acceleration of the pulleys and the tension T in the cord supporting the 612 Kg mass when it is released from rest.
Unpolarized light with an intensity of 275 W/m2 passes by the two polarizers whose transmission axes are at an angle of 30.0° with respect to each other. What is an intensity of the light transmitted through both polarizers.
An owl is chasing a squirrel and is using echolocation (the reflection of sound) to aid in the hunt. If the squirrel is 40.5 m from the owl, how long does it take sound to travel from the owl to the squirrel and then back to the owl? (Use 343m/s a..
A flight attendant pulls her 64 N flight bag a distance of 370 m along a level airport floor at a constant velocity. The force she exerts is 45 N at an angle of 51° above the horizontal.
The amplitude of the voltage across an inductor can be greater than the amplitude of the generator emf in an RLC circuit. Consider an RLC circuit with Epeak = 50 V, R = 14, L = 1.05 H, and C = 1.12 µ F. Find out the amplitude of the voltage across th..
A certain freely falling object requires 1.7s to travel the last 40m before it hits the ground. From what height above ground did it fall.
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