Physics 104 Exam 2 HW questions

What type of force holds atoms together in a crystal?

Electric

A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 second later? a. 100m b. 98m c. 50m d. 490m e. none of the above

a

According to Kepler, the paths of planets about the Sun are a. ellipses b. parabolas c. straight lines d. circles e. none of the above

a

An important feature of atoms is that they __________. a. have wave properties b. can barely be seen with the naked eye c. make up electric beams d. are tiny solar systems

a

How does one isotope differ from another? a. It has a different number of neutrons b. It has a different electric charge c. It has a different number of protons d. It has a different number of electrons

a

Nellie tosses a ball upward at an angle. Assuming no air resistance, which component of velocity changes with time? a. the vertical component b. the horizontal component c. both of these d. neither of these

a

The periodic table of the elements is a list of __________. a. Atoms b. Isotopes c. Molecules d. Ions

a

A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation 5 m above ground level. The ball lands 20 m downrange. The player's pitching speed is about a. 5 m/s b. .20 m/s c. 10 m/s d. 25 m/s e. none of the above

b

An Earth satellite is simply a projectile a. floating motionless in space near Earth b. freely falling around Earth c. approaching Earth from outer space

b

Which of the following are negatively charged? a. Protons b. Electrons c. Neutrons d. Atomic nuclei

b

Which of the following has the greatest density? a. All the same b. Gold c. Uranium d. Lead

b

Which of the following has the greatest outer surface area? a. A grape b. An elephant c. A peach d. A tiger

b

While a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its horizontal component of velocity a. increases b. remains unchanged c. decreases.

b

While an airplane flies at 40 m/s at an altitude of 500 meters, the pilot drops a heavy package that falls to the ground. Neglecting air drag, about where does the package land relative to the plane flying above? a. 500 m behind the plane b. directly beneath the plane c. 400 m behind the plane d. more than 500 m behind the plane e. none of the above

b

A bullet fired horizontally over level ground hits the ground in 0.5 seconds. If it had been fired twice the speed it would have hit the ground in a. more than 0.5 s. b. less than 0.5 s. c. 0.5 s.

c

According to Hooke's law, if you double the force when stretching a spring, the elongation of the spring is normally __________. a. no different, but the same b. four times as much c. twice as much d. half as much

c

According to Kepler, the speed of a planet is slowest when it is a. closest to the Sun b. neither, for speed is a constant c. farthest from the Sun

c

According to Kepler, the square of the orbital period of a planet is directly proportional to the a. square of the planet's average distance from the Sun b. planet's average distance from the Sun c. cube of the planet's average distance from the Sun.

c

Newton hypothesized that the forces acting on planets was a. along their directions of travel b. perpendicular to their directions of travel c. toward the Sun d. none of the above

c

Which of the following is stronger per bodyweight? a. A human b. An elephant c. An ant d. A fish

c

As the text cites, atoms are incredibly tiny, numerous, perpetually moving, and what else? a. Migratory b. Mainly in the air c, New in science d. Ageless

d

The name given to the shape of a sagging rope supported at its ends is a ____________. a. semi-circle b. hyperbola c. parabola d. catenary

d

What is a mixture? Cite two examples. a. Atoms pressed together without bonding: H2O and H2 b. Atoms of different elements with bonds between them: NaCl and H2O c. The same types of atoms bonded together: H2 and N2 d. Atoms pressed together without bonding: air and salt and sand

d

When a tree branch is bent, the region in the center of the branch is the __________. a. tensile layer b. compressed layer c. elastic layer d. neutral layer

d

Which investigator is credited for discovering Brownian motion? a. John Dalton b. Robert Motion c. Albert Einstein d. Robert Brown

d

Which of the following is an element? a. H2O b. Carbon dioxide c. A supernova d. Hydrogen

d