Physical Science Final Combine
[Problems #3 - #7] Imagine there is a planet which has the mass of twice more massive (2ME ) than the mass of Earth ( ME = 5.97 x 10^24 kg), but its shape and size (i.e. radius) is the same as Earth. Answer the questions below about this planet.
#3 - #7
[Problems #3 - #5] On a highway ramp, a car is turning around with a constant speed of 18 m/s.
#3-#5
[Problems #8 - #9] Imagine there is another planet which has the same mass as Earth (ME = 5.97 x 10^24 kg), but its size (or its radius) is twice greater than Earth (2RE). Answer the questions below about this planet.
#8 - #9
Which of the following objects are in uniform motion (in equilibrium)? Choose ALL uniform motions.
- A car heading north 35 mph - A book resting on your desk - An airplane cruising at 30,000 feet high at 50 mph
Which quantities below of a solid object on this planet are NOT the same as on Earth? Choose all possible answers.
- Acceleration when it falls vertically. - Weight
For projectile motion, what quantities are constant? (Neglect air resistance.) Choose all.
- Horizontal Acceleration - Vertical Acceleration - Horizontal Speed
A ball is dropped from the top of a building. What is the acceleration of the ball after 1.5 seconds later?
-9.8 m/s2
What is the unbalanced force (or net force) acting on a moving car with a constant velocity of 25 m/s (56 mi/h)?
0
What is the net force on a bag pulled down by gravity with a force of 18 newtons and pulled upward by a rope with a force of 18 newtons?
0N
In '1 kg = 2.20462 lb', what is the conversion factor?
1 kg = 2.20462 lb
An object has the mass of 10 kg on Earth. What would be the mass of this object at the surface of this planet?
10 kg
What would be the value of the gravitational acceleration at the surface of this planet?
19.6 m/s2
An object has the mass of 10 kg on Earth. What would be the weight of this object at the surface of this planet?
196 N
What is the right scientific measurement of the yardage here? (Fourth and 2.321 yards to go)
2.3 yards
Estimate the acceleration due to the gravity of this planet at its surface. Choose the closest value.
2.5 m/s2
Example 2.6 Finding Centripetal Acceleration (page 43) - Determine the magnitude of the centripetal acceleration of a car going 12 m/s (about 27 mi/h) on a circular cloverleaf with a radius of 50 m. (Fig. 2.13)
2.88 m/s2
Using the acceleration of the Earth from Problem 2 above, estimate the force needed for the Earth to stay in the orbit. (4 points)
3.582 x 10^22 m/s2
The radius of the ramp is 60 m. Find the acceleration of this car.
5.4 m/s2
An object has the mass of 20 kg on Earth. What would be the weight of this object at the surface of this planet? Choose the closest value.
50 N
Confidence Exercise 2.6, page 44 in Shipman Using the result of Example 2.3 (The orbital speed of the Earth is about 30 km/s), compute the centripetal acceleration in m/s2 of the Earth in its nearly circular orbit about the Sun (r = 1.5 × 1011 m) (4 points)
6.0 x 10^-3 m/s2
The car has the mass of 1250 kg. What is the force which the car needs to stay on the ramp?
6750 N
What does the car need for this circular motion?
Centripetal Force
Which one is the closest to explain 'Coordinates'?
Distance
Which statement below is correct about this planet?
Everything on the planet will fall twice faster than on Earth.
What supplies the centripetal force that keeps the planets in their orbits?
Gravitational Force
Chapter 3, MUTIPLE CHOICE, #9, page 76 in Shipman Which is true about the acceleration due to gravity?
It decrease with increasing altitude.
Which is true for an object in free fall?
It increases in distance proportionally to t2
Chapter 3, MULTIPLE CHOICE, #10, page 76 in Shipman What is true about the constant G?
It is a very small constant.
What Aristotelian idea did Galileo discredit in his fabled Leaning Tower demonstration?
Natural Motion
Which law of physics can explain your answer to the previous problem?
Newton's First Law of Motion - Law of Inertia
What kind of force causes it to move in a straight-line path after the break?
No Force
Which one below is not the fundamental force in nature?
Powerful Atomic Force
What is Science?
Study of Nature
A 10-kg rock and a 1-kg rock are dropped simultaneously from the same height. Which one below is NOT correct?
The 10-kg rock has 10 times faster than the 1-kg rock in falling.
Which is true of the force pair of Newton's third law?
The two forces act on different objects.
Which statement below is NOT correct about Significant Figures?
To get the most precise results in data analysis, you need to keep all digits (numbers) from calculator as Significant Figures.
Which of the statements below is NOT correct in describing science?
When more than two scientific ideas (theories) are conflicted against each other, the scientific principle (or natural law) should be decided after considering very carefully how the resulting principle will affect our environments and society.
Which of the statements below is NOT correct.
When you move for a longer distance, you are always fast.
You are moving with a CONSTANT ACCELERATION (not zero) in a linear motion. Which statement below is NOT correct?
You can stop for a while and start again.
By considering the horizontal motion in Galileo's inclined plane experiment, why was mass, a new concept at the time, needed to be introduced, even though weight (or heaviness) had already been used and understood by people very well.
Because weight is vertical force and cannot be used to explain the horizontal motion.
What is the weight of a 1.0-kg mass on the Earth?
9.8 N
Which statement is NOT correct about Einstein's theory of Gravity when it is compared to Newton's theory of Gravity?
According to Einstein's theory, gravitational force could be repulsive as well as attractive, which Newton's theory has only attractive gravitational force.
Find the statement which is NOT correct about Gravity.
According to Newton's theory of Gravity, the strength of gravitational force depends directly on the weight of objects.
Which one below is NOT correct about Aristotle's work?
Aritotle was very skillful to make various devices, and he use them for his observations and experiments.
Why do we use the decimal number system in Science/Engineering?
Because scientists and engineers decided to use it in their fields.
What do we call the gravitational force between the Earth and your body?
Weight
