Two balls are thrown off a building with the same speed, one straight up and one at a 45° angle. Which statement is true if air resistance can be ignored?
(a) Both hit the ground at the same time.
(b) Both hit the ground with the same speed.
(c) The one thrown at an angle hits the ground with a lower speed.
(d) The one thrown at an angle hits the ground with a higher speed.
(e) Both (a) and (b).
Ans: (b) Both hit the ground with the same speed.
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When you walk forward on a scooter that was previously at rest, how do you calculate the total momentum of you and the scooter?
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Ice or compacted snow sublimes to a saturated vapor in cold climates. Estimate the rate at which ice will sublime per unit area on an iceberg if the ice is -30ºC and the air is - 10ºC. Assume a convective heat transfer coefficient of 20 W/m^2?K.
What will be an ideal response?
AC Generator: The coil of an ac generator has 50 loops and a cross-sectional area of 0.25 m2. What is the maximum emf that can be generated by this generator if it is spinning with an angular speed of 4.0 rad/s in a 2.0-T magnetic field?
A. 50 V B. 100 V C. 200 V D. 400 V
For total internal reflection, light is ______________ and none is ______________
a. refracted; reflected b. refracted; transmitted c. reflected; transmitted d. transmitted; reflected