What do scientists believe to have caused the Tunguska event?
a. a comet
b. an iron asteroid
c. a stony-iron meteorite
d. a stony asteroid
e. a carbonaceous chondrite
d
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A pump uses a piston of 15 cm diameter that moves at 2.0 cm/s as it pushes a fluid through a pipe. What is the speed of the fluid when it enters a portion of the pipe that is 3.0 mm in diameter? Treat the fluid as ideal and incompressible
A) 50 m/s B) 50 cm/s C) 6.0 cm/s D) 22 cm/s
In a 2-dimensional Cartesian system, the y component of a vector is known, and the angle between vector and x axis is known. Which operation is used to calculate the magnitude of the vector (taken with respect to the y component)?
a. dividing by cosine c. multiplying by cosine b. dividing by sine d. multiplying by sine
Which type of heating causes sunburn?
a. conduction c. radiation b. convection d. all of the above
The energy stored in a pile driver is an example of gravitational potential energy
a. True b. False Indicate whether the statement is true or false