The number of Type I and Type II supernovae observed are approximately equal
Indicate whether the statement is true or false
TRUE
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What will be an ideal response?
A straight wire is bent into the shape shown. Determine the net magnetic force on the wire when the current I travels in the direction shown in the magnetic field 
.
A. 2IBL in the ?z direction B. 2IBL in the +z direction C. 4IBL in the +z direction D. 4IBL in the ?z direction E. zero
The heating element in an electric drier operates on 240. V and generates heat at the rate of 2.00 kW. The heating element shorts out and, in repairing it, the owner shortens the Nichrome wire by 10%
(Assume the temperature is unchanged, although in reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element?
Why is Mars' greenhouse effect negligible compared to that of Earth's?
A) Its mass is only one-ninth of Earth's. B) Greenhouse gas emissions were greatly curtailed according to the International Mars Greenhouse Gas Reduction Treaty of 2003. C) The Martian atmosphere is much thinner and retains little heat. D) Martian carbon dioxide contains a rare isotope with little ability to trap heat.