A heat engine has an efficiency of 35.0% and receives 150 J of heat per cycle. How much work does it perform in each cycle?
A. zero
B. 52.5 J
C. 97.5 J
D. 150 J
B. 52.5 J
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A fossil is found in a layer of strata below one layer dated at 8 million years. From this we can deduce the age of the fossil to be
A) between 7 and 8 million years old B) we can tell nothing about the fossil's age from this data C) older than 8 million years D) younger than 7 million years
In an elastic collision between two bodies of equal mass, with body 2 initially at rest, body 1 moves off at angle ? relative to the direction of its initial velocity and body 2 at angle ?. The sine of the sum of ? and ?, sin(? + ?), is equal to
a. 0. b. 0.500. c. 0.707. d. 0.866. e. 1.00.
The __________ states that a particle cannot be precisely localized
Fill in the blank(s) with correct word
The windings of a motor have a resistance of 4.0 ?. The counter emf of this motor when connected to a 120-V line and running at full speed is 104 V
(a) What is the start up current of this motor? (b) What is the current in the motor when running at full speed?