If the activity of a sample of 232Th decreases from 1000 cpm to 500 cpm in 60 min, in another 60 min its activity will be
a. 500 cpm.
b. 0 cpm.
c. 250 cpm.
d. 125 cpm.
c
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Constant Acceleration Kinematics: At the instant a traffic light turns green, a car that has been waiting at the intersection starts ahead with a constant acceleration of 2.00 m/s2. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.(a) Calculate the time necessary for the car to reach the truck.(b) Calculate the distance beyond the traffic light that the car will pass the truck.(c) Determine the speed of the car when it passes the truck.
What will be an ideal response?
To melt 50 g of 0°C ice requires
A) 25 calories. B) 50 calories. C) 80 calories. D) none of the above
The water level in identical bowls, A and B, is exactly the same. A contains only water; B contains floating ice as well as water. When we weigh the bowls, we find that
a. WA < WB. b. WA = WB. c. WA > WB. d. WB > WA if the volume of the ice cubes is greater than 1/9 the volume of the water. e. WB > WA if the volume of the ice cubes is greater than 9 times the volume of the water.
Resistivity and Temperature: The temperature coefficient of resistivity of platinum is 3.9 × 10-3/C°. If a platinum wire has a resistance of R at a temperature of 23°C, to what temperature must it be heated in order to double its resistance to 2R?
A. 280°C B. 300°C C. 730°C D. 930°C