A sphere is constructed of two concentric pieces. The inner part is a solid sphere of radius 10.0 cm made of a material with density 4000 kg/m3. The outer part is a spherical shell with inner radius 10.0 cm and outer radius 20.0 cm
The outer shell has a density 9000 kg/m3. (a) What is the mass of this sphere? (b) What is the average density of this sphere?
(a) 281 kg
(b) 8.38 × 103 kg/m3
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Suppose that you wish to construct a simple ac generator having an output of 12 V maximum when rotated at 60 Hz. A uniform magnetic field of 0.050 T is available. If the area of the rotating coil is 100 cm2, how many turns do you need?
A) 16 B) 8 C) 32 D) 128 E) 64
A ball is launched from ground level at 30 m/s at an angle of 25° above the horizontal. How far does it go before it is at ground level again?
a. 14 m c. 43 m b. 70 m d. 86 m
An unknown resistor is wired in series with an ammeter, and a voltmeter is placed in parallel across both the resistor and the ammeter. This network is then placed across a battery
If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained A) is less than the true resistance. B) is greater than the true resistance. C) is the true resistance. D) could be any of the given answers. It depends on other factors.
The increase in the amount of carbon dioxide in the atmosphere is responsible for __________
Fill in the blank(s) with correct word