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Physics final concept problems
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Terms in this set (21)
Object A has density p1. Object B has the same shape and dimensions as object A, but it is four times as massive.
Object B has density p2 such that...
A. P2 = 2p1
B. P2 = p1/2
C. P2 = 4p1
D. P2 = P1/4
E. P2 = p1
C
Water flows through a 0.5 cm diameter pipe connected to a 1 cm diameter pipe.
Compared to the speed of the water in the 0.5 cm pipe, the speed in the 1 cm pipe is...
A. quadruple the speed in the 0.5 cm pipe.
B. one‑half the speed in the 0.5 cm pipe.
C. the same as the speed in the 0.5 cm pipe.
D. double the speed in the 0.5 cm pipe.
E. one‑quarter the speed in the 0.5 cm pipe.
E
Blood flows through an artery that is partially blocked.
As the blood moves from the wider region into the narrow region, the blood speed...
A. Increases
B. Decreases
C. Stays the same
D. Drops to zero
E. Alternately increases and then decreases
A
An object floats in water with 5/8 of its volume submerged. The ratio of the density of the object to that of water is...
A. 5/8
B. 3/8
C. 8/5
D. 1/2
E. 2/1
A
A toy floats in a swimming pool.
The buoyant force exerted on the toy depends on the volume of...
A. The toy above water
B. The toy under water
C. The pool
D. All the water in the pool
E. None of these choices
B
Consider Bernoulli's equation.
1/2pv^2 +P + pgy = constant
Bernoulli's equation is the result of...
A. The conservation of mass for a moving fluid
B. Newton's third law for moving a fluid
C. The conservation of linear momentum for a moving fluid
D. The conservation of energy for a moving fluid
E. The equation of continuity for a moving fluid
D
Suppose that a solid ball, a solid disk, and a hoop all have the same mass and the same radius. Each object is set rolling without slipping up an incline with the same initial linear (translational) speed.
Which object goes farthest up the incline?
A. The ball rolls the farthest
B. The hoop and the disk roll to the same height, which is farther than the ball rolls
C. The hoop rolls the farthest
D. They all roll to the same height
E. The disk rolls the farthest
C
How would a spinning disk's kinetic energy change if its moment of inertia was five times larger but its angular speed was five times smaller?
A. 0.2 times as large as before
B. 5 times as large as before
C. the same as before
D. 0.1 times as large as before
E. 10 times as large as before
A
A wet lump of clay and a bouncy rubber ball, both of mass 𝑚,
are thrown at a wall. Both strike the wall at speed 𝑣,
but although the ball bounces off with no loss of speed, the clay sticks.
What are the changes in momentum of the clay and ball, respectively?
A. mv; mv
B. mv; 0
C. 0; 2mv
D. mv; 2mv
E. 0; mv
D
Consider a completely elastic head-on collision between two particles that have the same mass and the same speed.
What are the velocities of the particles after the collision?
A. The magnitudes of the velocities are the same but the directions are reversed.
B. One of the particles continues with the same velocity, and the other reverses direction at twice its previous speed.
C. More information is required to determine the final velocities.
D. One of the particles continues with the same velocity, and the other comes to rest.
E. Both velocities are zero.
A
Every object in the universe with mass experiences an attractive gravitational force due to every other object with mass.
Why don't you feel a pull from objects close to you?
A. Gravitational forces only cause circular or elliptical motion, such as orbital motion. They do not cause linear motion, so there is no linear attraction.
B. The gravitational forces between people and ordinary objects are far too small for people to feel.
C. Newton's law of universal gravitation is only valid when one of the interacting objects is a massive celestial body like a moon, a planet, or a star.
D. People don't notice the gravitational pull of ordinary objects because the gravitational attraction of the Earth is so large.
B
For an object moving in uniform circular motion, select the quantities that are 0 over one revolution.
A. Instantaneous acceleration
B. Average velocity
C. Displacement
D. Average acceleration
E. Instantaneous velocity
B, C, D
Sandra is on a rotating Ferris wheel.
When Sandra is at the bottom of the Ferris wheel's rotation, how does the magnitude of the normal force 𝑁 exerted on her by her seat compare to her weight 𝑚𝑔?
A. N < mg
B. N > mg
C. N = mg
D. N = 2mg
E. N = 1/2mg
B
While an elevator traveling upward slows down to stop, the normal force on the feet of a passenger is _________ her weight. While an elevator traveling downward slows down to stop, the normal force on the feet of a passenger is __________ his weight.
Options:
-larger than
-smaller than
-equal to
Choose one of the above for each fill in the blank
Smaller than, larger than
Two golf balls are hit from the same point on a flat field. Both are hit at an angle of 45° above the horizontal. Ball 2 has twice the initial speed of ball 1. If ball 1 lands a distance 𝑑1 from the initial point, at what distance 𝑑2 does ball 2 land from the initial point? Neglect any effects due to air resistance.
A. d2 = 0.5d1
B. d2 = 8d1
C. d2 = 2d1
D. d2 = d1
E. d2 = 4d1
E
The slope at a point on a position versus time graph of an object is...
A. the object's average velocity over a time interval centered on that point.
B. the object's instantaneous acceleration at that point.
C. the object's average acceleration over a time interval centered on that point.
D. the object's speed at that point.
E. the object's instantaneous velocity at that point.
E
When throwing a ball straight up, which of the following are correct about the magnitudes of its velocity 𝑣 and its acceleration 𝑎 at the highest point in its path?
A. v = 0 but a = 9.8 m/s^2
B. Both v = 0 and a = 0
C. v is not equal to 0 but a = 0
D. v is not equal to 0 but a = 9.8 m/s^2
E. Not enough information to determine the magnitudes of v and a
A
A 1-kg ball and a 10-kg ball are dropped from a height of 10 m at the same time. In the absence of air resistance,
A. the two balls will hit the ground at the same time.
B. the 1 kg ball will hit the ground first.
C. the 10 kg ball will hit the ground first.
D. the 10 kg ball will take 10 times the amount of time to reach the ground.
E. there is not enough information to determine which ball will hit the ground first.
A
Which is larger, the Sun's pull on Earth or Earth's pull on the Sun?
A. They pull on each other equally.
B. The Sun's pull on Earth is larger.
C. Earth's pull on the Sun is larger.
D. The Sun's pull on Earth is twice as large as Earth's pull on the much larger Sun.
E. There is no pull or force between Earth and the Sun.
A
A satellite and the International Space Station have the same mass and are going around Earth in concentric orbits. The distance of the satellite from Earth's center is twice that of the International Space Station's distance.
What is the ratio of the centripetal force acting on the satellite compared to that which is acting on the International Space Station?
A. 1
B. 0.5
C. 0.25
D. 2
E. 4
C
The escape speed from planet X is 𝑣. Planet Y has the same radius as planet X but is twice as dense.
The escape speed from planet Y is...
A. v
B. v/2
C. (Sqrt. 2)v
D. 2v
E. v/sqrt. 2
C
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