WorksheetsCh. 4 Review
Total questions: 20
Worksheet time: 3600secs
What force is described as the attraction between a sample of matter and all other matter in the universe?
Gravitational Force
Electromagnetic Force
Weak Nuclear Force
Strong Nuclear Force
Astronomers use the gravitational wobble of a star to indicate the presence of planets outside our solar system. Astronomers specifically look for planets in the habitable zone of 1.6 X 10^11 m away from the star.
Calculate the mass of a planet that exerts a 1.5 X10^13 N force on a 5.4 X 10^30 kg star.
6.7 X 10^3 kg
1.1 X 10^15 kg
1.0 X 10^17 kg
1.3 X 10^45 kg
Using the gravitational force of a satellite to deflect an asteroid from colliding with Earth is not feasible because —
the gravitational force of the asteroid is greater than that of the satellite
the magnitude of the gravitational force is small
friction in space will resist gravitational force between objects
the gravitational force only exists between large objects
A student attempts to measure the maximum possible distance two masses can be away from one another and still register on the force-meter available. The masses are 2 kg and 7 kg respectively while the force-meter is capable of detecting a force as low as 0.000002 N.
What is the greatest distance the masses can be apart and still register on the force-meter?
4.67 X 10^-4 m
2.16 X 10^-2 m
2650 m
7,000,000 m
What is the gravitational force between two identical 5000 kg asteroids whose centers of mass are separated by 100 m?
1.67 X 10^-7 N
1.67 X 10^-4 N
8300 N
49,000 N
A probe is sent to a planet of unknown mass. The probe has several instruments for measuring and sending information back to Earth. The probe gathered the information below when analyzing the gravitational force the planet exerts. A computer glitch prevents the probe from sending the units of measurement for the independent variable.
Refer to the above information and graph. A student has been tasked with interpreting the data. What units should be used to describe the independent variable?
kg
m
N
Nm^2/kg^2
Calculate the force of gravity between the Earth and the Moon given the following numbers:
Mass of Earth = 5.97 x 10^24 kg
Mass of Moon = 7.35 x 10^22 kg
Distance between the Earth and the Moon = 3.84 x 10^8 m
Gravitational constant G = 6.67 x 10^-11 m3/(kgs2)
(a)
Two identical asteroids are initially at rest with the only forces being gravitational attraction
Which of the following best describes the acceleration of the asteroids shown above?
The acceleration will decrease until the asteroids collide
There is no acceleration, the asteroids will move toward each other at constant velocity
The acceleration remains constant until the asteroids collide
The acceleration will increase until the asteroids collide.
When the distance between two objects is doubled, the gravitational force between them decreases by a factor of 4.
What happens to the gravitational force when the distance between two objects is tripled?
By what factor does the force of gravitational attraction between the two objects change?
Increases
6
Increases
9
Decreases
6
Decreases
9
How does the force of gravitational attraction between two objects change when the mass of one object is cut in half and the distance between the centers of the objects doubles?
The force of gravitational attraction
Decreases
4
Decreases
8
Increases
4
Increases
8
Which is an example of a natural process that involves the strong nuclear force?
two oppositely charged ions forming a chemical bond
two hydrogen atoms fusing together inside the core of a star
water flowing downstream toward a lower elevation
a car pushed backwards after colliding head–on with another vehicle
Which choice provides evidence of the weak nuclear force?
the Earth constantly revolving around the Sun in orbit getting shocked by touching a metal doorknob after walking across the carpet
a uranium nucleus breaking into barium and krypton nuclei
carbon-14 turning into nitrogen-14 after undergoing beta decay
None of the above.
Which action is caused by the strong nuclear force?
elementary particles change from one type to another
two protons repel each other
the Earth revolves around the Sun
protons and neutrons are bound together in a nucleus
Which example does not demonstrate evidence of the electromagnetic force?
creating rotational motion with a motor
an apple falling to the ground from a tree
storing information on a computer hard drive
plugging in a kitchen appliance
You rub a balloon against a wool sweater. During the process, electrons are transferred from the sweater to the balloon. Which statement best describes the balloon and the sweater after the electrons are transferred?
The balloon is now negative and the sweater is now positive so they attract.
The balloon is now negative and the sweater is now positive so they repel.
The balloon is now positive and the sweater is now negative so they attract.
The balloon is now positive and the sweater is now negative so they repel.
The transfer of electrons equals out the charges so the balloon and the sweater are neutral and do not attract or repel.
Which statement accurately describes the weak nuclear force?
It is used to explain beta decay.
It causes the repulsion between like charged particles.
It is the weakest of the fundamental forces.
It has an infinite range.
Which item does not utilize the magnetic force as a primary function?
9-volt battery
computer hard drive
Loudspeakers
compass
A planet with a mass of 4.57×10^15kg is 2.74×10^8m away from another planet with a mass of 4.28×10^15kg. What force of gravitational attraction is acting between the planets?
(a)
Scientists are studying two asteroids with known masses. The smaller asteroid has a mass of 9.64×10^15kg, and the larger asteroid has a mass of 8.34×10^20kg. If the force of gravitational attraction between two asteroids is known to be 6.13×10^7N, how far apart must the centers of the two asteroids be?
(a)
Captain Kirk (100 kg) beams down to a planet that is the same size as Neptune, 2.44X10^9 m, and finds that he weighs 1355N. What is the mass of that planet?
(a)
