A box of mass 50 kg is at rest on a horizontal frictionless surface. A constant horizontal force F then acts on the box and accelerates it to the right. It is observed that it takes the box 6.9 seconds to travel 28 meters
What is the magnitude of the force?
59 N
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Luminosity (absolute brightness) of a star depends on its ________.
A. temperature and radius B. radius and distance C. mass and age D. distance and mass E. age and temperature
The temperature of a 100 m diameter cooling pond is 7°C on a winter day. If the air temperature suddenly drops to –7°C, calculate the thickness of ice formed after three hours.
GIVEN
? A round cooling pond on a winter day
? Initial temperature (Tl) = 7°C
? Air temperature (T?) drops to –7°C
? Pond diameter (D) = 100 m
FIND
? The thickness of ice (?) formed after 3 hours
ASSUMPTIONS
? The thermal capacitance of the ice layer is negligible
? Radiative heat transfer is negligible
? Bulk water temperature remains constant at 7°C
? Air temperature is constant at –7°C
? The air and water are still
SKETCH
PROPERTIES AND CONSTANTS
The ice property values given in the problem statement of Problem 9.37 is
Extrapolating from Appendix 2, Table 28, for dry air at the estimated film temperature of –3.5°C
From Appendix 2, Table 13, for water at the estimated film temperature of 3.5°C
How do we account for the great variety of substances in the world?
A) The Earth is 4.5 billion years old. B) Most of these substances are organic compounds. C) Atoms are incredibly small. D) There are many possible combinations of atoms.
The ground observer shown here sees the cans explode at the same time, yet the observer in the van sees the can on the right explode first. Suppose instead that the cans were side-by-side, one on the driver's side of the van and the other on the passenger's side. If the ground observer again saw the cans explode at the same time, what would the observer in the van see?
a. The can on the driver's side of the van explodes first. b. The can on the passenger's side explodes first. c. The cans explode at the same time.