Two resistors with resistances of 5.0 ? and 9.0 ? are connected in parallel. A 4.0-? resistor is then connected in series with this parallel combination. An ideal 6.0-V battery is then connected across the series-parallel combination
What is the current through (a) the 4.0-? resistor and (b) the 5.0-? resistor?
(a) 0.83 A (b) 0.53 A
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A 24.5-kg child is standing on the outer edge of a horizontal merry-go-round that has a moment of inertia of about a vertical axis through its center and a radius of 2.40 m
The entire system (including the child) is initially rotating at 0.180 rev/s. Find the angular velocity if the child moves to a new position 1.10 m from the center of the merry-go-round.
If your mass is 60 kilograms on Earth, what is it on the Moon?
A. 120 kilograms, because the Moon's gravity is greater than Earth's B. 0 kilograms, because the Moon has no gravity C. 60 kilograms, because mass does not depend on gravity D. 360 kilograms, because the Moon is a spherical object
A 0.20-kg object attached to the end of a string swings in a vertical circle (radius = 80 cm). At the top of the circle the speed of the object is 4.5 m/s. What is the magnitude of the tension in the string at this position?
A. 7.0 N B. 2.0 N C. 3.1 N D. 5.1 N E. 6.6 N
If the surface of our bodies is at 37°C, at what wavelength does the radiation that we emit peak if we behave like a blackbody? The constant in Wien's law is 0.0029 m ? K
What will be an ideal response?