Physical Science Final

A ball is dropped. Assume it is free fall. What is the initial speed?

+9.8 m/s2

What is necessary for a change in velocity?

an unbalanced force

A change in linear momentum requires which of following?

an unbalanced force a change in velocity an acceleration

Do highway speed limit signs refers to average speeds or to instantaneous speeds?

instantaneous speed

Which one of the following describes an object in motion?

it is continuously changing position

How many base units are there in the SI?

seven

For a constant linear acceleration, what changes uniformly?

velocity

What do we call the gravitational force between the Earth and your body?

weight

What is the right scientific measurement of the yardage here?

2.3 yards

Write the numbers below in Scientific Notation. 230.90 -0.0000768

2.3090x10^2 -7.68x10^-5

A force of 2.1 N is exerted on a 7.0 g rifle bullet. What is the bullet's acceleration?

300m/s2

Fill in the blanks with the correct numbers for the metric prefixes.

(a) 40,000,000 bytes = 40Mb (b) 0.5722 L = 572.2 mL (c) 540.0 m = 54000cm (d) 5,500 bucks = 5.500 kilobucks

A ball is dropped. Assume it is free fall. What is the final acceleration?

-9.8 m/s2

A ball is dropped. Assume it is free fall. What is the its initial acceleration?

-9.8 m/s2

Two 1-kg balls move away from each other: one travels 5 m/s to the right, the other 5 m/s to the left. What is the total momentum this system?

0

What is the unbalanced force (or net force) acting on a moving car with a constatnt 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 N and pulled upward by a rope with a force of 18 N?

0 N

[Questions #7-#10] Consider a fish that swims toward and swallows a smaller fish at rest as shown in the figure here. The larger fish has a mass of 5 kg and swims 1 m/s toward a 1-kg fish before lunch What is the velocity of the larger fish immediately after lunch?

0.83 m/s

A horizontal force of 250 N is applied to a stationary woodern box in one direction, and a 600-N horizontal force is applied in the opposite direction. What additional force is needed for the box to remain stationary?

350 N

What is the weight of a 1.0-kg mass on the Earth? Choose the closest value.

10 N

Use conversion factors below; 1 inch = 2.54 cm 1 kg = 2.20462 lb 1 mile = 1.61 km and SI prefix, convert the following measurements to the desired unit. Be careful with the precision of each measurement.

12.34 inches = 31.3cm 12.34 lb = 5.6 kg 12.34 m/s = 44.42 km/hr

What is the impulse on an 8-kg ball rolling at 2 m/s when it bumps into a pillow and stops?

16 kg m/s

What is the impulse on an 8-kg ball rolling at 2 m/s?

16kg m/s

In '1 kg = 2.20462 lb', what is the conversion factor?

1kg= 2.20462lb

[Questions #7-#10] Consider a fish that swims toward and swallows a smaller fish at rest as shown in the figure here. The larger fish has a mass of 5 kg and swims 1 m/s toward a 1-kg fish before lunch What is the total momentum of the system of two fish before the lunch?

5 kg m.s

[Questions #7-#10] Consider a fish that swims toward and swallows a smaller fish at rest as shown in the figure here. The larger fish has a mass of 5 kg and swims 1 m/s toward a 1-kg fish before lunch What is the total momentum of the system of two fish after the lunch?

5 kg m/s

The speed of light in space (vacuum) is c = 3.00 × 10 8 m/s. (The speed of light is given the special symbol, c.) How many seconds does it take light from the Sun to reach the Earth if the distance from the Sun to Earth is 1.5 × 10 8 km. Choose the closest value

500 s

Two 100-kg cars drive east: the first moves at 20 m/s, the second at 40 m/s. What is the total momentum this system?

6000 kg m/s`

Which one below is NOT an example of 'Natural Motion' of Aristotls?

A Baseball hit by a bat.

Which of the following objects are in uniform motion (in equilibrium)? Choose ALL uniform motions.

An airplane cruising at 30,000 feet high at 50 mph A car heading north 35 mph A book resting on your desk

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

On a highway ramp, a car is turning around with a constant speed of 40 mph. What does the car need for this motion?

Centripetal force

What is a possible state of an object in the absence of a net force?

Constant speed At rest Zero Acceleration

What is the motivation of scientific activities?

Curiosity

Which one below doe NOT belong to Physical Science?

Mathematics

Which are TWO subfields of Science?

Life Science Physical Science

What supplies the centripetal force that keeps the planets in their orbits?

Gravitational Force

A car is moving with a constant speed in linear motion, and travels 80 km in one hour. Which one of the statements below are NOT correct?

If it increases its speed, it will take longer than one hour to travel 80 km.

Which is true about the acceleration due to gravity?

It decrease wit increasing altitude.

Which is tru for an object in free fall?

It increases in distance proportionally to t2

What is true about the constant G?

It is a very small constant.

Which one of the following is a concise statement about a fundamental relationship in nature? [MULTIPLE CHOICE #2, Page22 in Shipman

Law

What Aristotelian idea did Galileo discredit in his fabled Leaning Tower demonstration?

Natural Motion

Which one below is not a member of Lepton family?

Neutron

In the previous problem about the straight-line motion of the can after the string was broken, which law of physics can explain your answer?

Newton's First Law of Motion - Law of Inertia

If the string that holds a whirling can in its circular path breaks, what kind of force causes it to move in a straight-line path?

No force

Which is the most fundamental of the physical science? [from Chapter 1 MULTIPLE CHOICE #1, page 22 in Shipman]

Physics

Which one below is not the fundamental force in nature?

Powerful Atomic Force

What is science?

Study of Nature

Which is true of the force pair of Newton's third law?

The two forces act on different objects.

What Aristotelian idea did Galileo demolish with his experiment with inclined planes?

Theory of Violent motion

Which one below is NOT correct to describe the works of Tycho Braha and Johannes Kepler as scientific methods?

They developed and proposed the theory to explain the motion of planets of the solar system with a find hypothesis for the first time in history.

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

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.

What is necessary to designate a position?

a reference point

Which one below is NOT a quark?

cool

Which one is the closest to explain 'Coordinates'?

distance

The total linear momentum is not conserved if there is a(n) _______ force acting on the system.

external

Can an object be at rest if forces are being applied to it?

yes