A fireman, 40.0 m away from a burning building, directs a stream of water from a fire hose at an angle of 30.0° above the horizontal. If the initial speed of the stream is 40.0 m/s, at what height above the nozzle will the stream of water strike the building?
a. 9.60 m
c. 18.7 m
b. 16.6 m
d. 22.4 m
B
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Fill in the blank(s) with correct word
Slanting Surfaces Without Friction: A system consisting of blocks, a light frictionless pulley, a frictionless incline, and very light connecting wires is shown in the figure. The wires pull on the left-hand blocks parallel to the surface of the ramp. The 9.0-kg block accelerates downward when the system is released gently from rest.(a) What is the magnitude of the acceleration of the 9.0-kg block?(b) What is the tension in the wire connecting the two blocks on the incline?
What will be an ideal response?
You can raise the temperature of an object with
a. microwaves. b. infrared waves. c. ultraviolet rays. d. all of the above. e. only (a) and (b) above.
The crust of the Earth is covered by about ________ water in the hydrosphere
A) 50% B) 60% C) 70% D) 80% E) 90%