If the speed of a motor scooter doubles, which of the following also doubles?
A) momentum
B) kinetic energy
C) acceleration
D) all of the above
Answer: A
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Latent Heats: A beaker of negligible heat capacity contains 456 g of ice at -25.0°C. A lab technician begins to supply heat to the container at the rate of 1000 J/min. How long after starting will the ice begin to melt, assuming all of the ice has the same temperature? The specific heat of ice is 2090 J/kg ? K and the latent heat of fusion of water is 33.5 × 104 J/kg.
Fill in the blank(s) with the appropriate word(s).
A light bulb operating at a voltage of 120 Volt has a power of 60 W. What is the current flowing through this bulb?
A) 1.5 A B) 2.5 A C) 0.5 A D) 2 A E) 1 A
A circular loop of wire has its radius reduced in half in time ?t. A uniform magnetic field is at an angle of 60° to the plane of the coil, and the magnetic field doubles its intensity in the same time interval ?t. During this interval, what happens to the flux through the coil?
a. It increases. b. It decreases. c. It remains the same. d. More information is needed to make this conclusion.
Express (4.3 × 106)-1/2 in scientific notation
A) 2.1 × 103 B) 2.1 × 104 C) 2.1 × 10-5 D) 4.8 × 10-4