The ""billiard ball model" of the atom is associated with
a. Bohr.
b. Thomson.
c. Rutherford.
d. Dalton.
d
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Pascal's Principle: The small piston of a hydraulic lift has a diameter of 8.0 cm, and its large piston has a diameter of 40 cm. The lift raises a load of 15,000 N. Assume the pistons each have negligible weight.(a) Determine the force that must be applied to the small piston.(b) Determine the pressure applied to the fluid in the lift.
What will be an ideal response?
Which of the following is a technique that can be used to speed up a spacecraft without the need for extra fuel?
A) a gravitational slingshot, in which the spacecraft gains momentum by flying near a planet B) releasing unnecessary weight after takeoff to make the spacecraft lighter C) flattening after takeoff to make the spacecraft more aerodynamic D) landing on a fast-moving asteroid and relaunching at high speed E) collect material in space that can power the spacecraft
You can only see a rainbow if
A) the sun is behind you. B) the sun is in front of you. C) the sun is 90° to the side. D) the sun is 180° to the side.
The space between the stars is known to contain
A. a perfect vacuum. B. a large quantity of dust but no gas at all. C. a variable amount of gas but no dust at all. D. both gas (atomic or molecular) and dust.