A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case
Case A: Thrown straight up.
Case B: Thrown straight down.
Case C: Thrown out at an angle of 45° above horizontal.
Case D: Thrown straight out horizontally.
In which case will the speed of the stone be greatest when it hits the water below if there is no significant air resistance?
A) Case A
B) Case B
C) Case C
D) Case D
E) The speed will be the same in all cases.
E
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A 4 ft radius spherical container holds helium gas at 20 psia and 95ºF. Estimate the amount of helium lost through diffusion in 24 hours if the sphere is made of silicon dioxide, SiO2 (glass) and if it is assumed that at a point 1/8 inches into the container wall from the inside the concentration of helium is zero.
What will be an ideal response?
In general, the greater the mass of the protostar, the ________ it contracts to the main sequence
Fill in the blank(s) with correct word
A galaxy with a blueshift is moving ________ Earth
Fill in the blank(s) with correct word
Magnetic confinement is used in controlled fusion experiments to
a. provide neutrons. b. accelerate nuclei. c. control a plasma. d. excite nuclei into higher energy levels. e. inject energy into nuclei.