SCNC 205 Final

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is more than 10 N. less than 10 N. 10 N.

10 N

If a baseball being thrown goes from zero to 30 m/s in 0.1 s, what is its average acceleration? 3 m/s2 30 m/s2 300 m/s2 3000 m/s2 none of the above

300 m/s2

If a rocket initially at rest accelerates at a rate of 50 m/s2 for 1 min, its speed will be 50 m/s. 500 m/s. 3000 m/s. 3600 m/s. none of the above

3000 m/s

Starting from rest, the distance a freely falling object will fall in 10 s is about 10 m. 50 m. 100 m. 500 m.

500 m

Which of the following involves passion, talent, and intelligence? Art Literature Science all of the above

All of the above

Ancient Greek investigators discovered.. Earth's circumference. why things float. that Earth rotates daily. all of the above

All of the above.

The first to be credited for Earth circling the Sun was Galileo. Copernicus. Newton. all at about the same time

Copernicus

The scientist to be arrested for his views was... Galileo. Copernicus. Newton. none of the above

Galileo.

Whenever the net force on an object is zero, its acceleration may be zero. is zero.

Is zero

The hang time of professional basketball players is typically less than 1 s. 1 s. more than 1 s. more than 2 s

Less than 1 s.

Reasonable and valid questions that are not testable are a small segment of the scientific method. lie outside the domain of science. have no value. all of the above

Lie outside the domain of science.

Scientists who falsify experimental results or data are generally given a second chance. no second chance. a slap on the hand. only slight praise.

No second chance

Compared with a 1-kg block of solid iron, a 2-kg block of solid iron has the same mass. volume. weight. all of the above none of the above

None of the above

Where is friction most evident? on the road in a cup of coffee in the atmosphere everywhere

On the road

Holding a card with a tiny opening in sunlight produces an image of the Sun on the ground below. If you hold the card a bit closer to the ground, the pinhole image is.. larger. smaller. the same size. impossible to say

Smaller

Compared with the mass of a certain object on Earth, the mass of the same object on the Moon is less. more. the same.

The same

Drop a rock from a 5-m height and it accelerates at 10 m/s2 and strikes the ground 1 s later. Drop the same rock from a height of 2.5 m and its acceleration of fall is about half. the same. twice as much.

The same

A valid hypothesis must be capable of being proved wrong. sort of right. right beyond doubt. by other investigators.

Wrong

Which has the greater mass? a king-size pillow an automobile battery both about the same

an automobile battery

If a freely falling object were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be constant. less and less. greater than the second before.

greater than the second before.

A kilogram is a measure of an object's weight. force. mass. gravity. center of mass

mass

What is the acceleration of a car that maintains a constant velocity of 100 km/h for 10 s? 0 m/s2 10 km/h/s 10 m/s2 1000 km/h/s

0 m/s2

An object travels 8 m in the 1st second of travel, 8 m again during the 2nd second of travel, and 8 m again during the 3rd second. Its acceleration is therefore 0 m/s2. 5 m/s2. 8 m/s2. 10 m/s2. more than 10 m/s2.

0 m/s2.

Which has the greatest density? 1 kg of feathers 10 kg of feathers 1 kg of lead

1 kg of lead

Starting from rest, the distance a freely falling object will fall in 0.5 s is about 0.5 m. 1.0 m. 1.25 m. 5.0 m. none of the above

1.25 m

A 1-kg mass at Earth's surface weighs about 1 N. 5 N. 10 N. 12 N. none of the above

10 N

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by about 5 m/s. 10 m/s. 15 m/s. a variable amount depends on its initial speed

10 m/s

The gain in speed each second for a freely falling object is about 0 m/s. 5 m/s. 10 m/s. 20 m/s. depends on the initial speed

10 m/s

A car accelerates at 2 m/s2. Assuming the car starts from rest, how far will it travel in 10 s? 2 m 10 m 40 m 100 m 200 m

100 m

Ten seconds after starting from rest, a freely falling object on Earth will have a speed of about 10 m/s. 50 m/s. 100 m/s. more than 100 m/s.

100 m/s

The average speed of a horse that gallops a distance of 10 km in a time of 30 min is 10 km/h. 20 km/h. 30 km/h. more than 30 km/h.

20 km/h

If a rocket accelerates from rest at a rate of 50 m/s2 for 10 s, the distance it will cover during this time is about 250 m. 500 m. 2500 m. 5000 m. none of the above

2500 m.

A 300-kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is 30 N. 300 N. 3000 N. more than 3000 N.

3000N

A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is 200 N. 400 N. 800 N. 1600 N. none of the above

400 N

An object is pulled northward with a force of 10 N and southward with a force of 15 N. The magnitude of the net force on the object is 0 N. 5 N. 10 N. 15 N. none of the above

5 N

One-half second after starting from rest, a freely falling object will have a speed of about 20 m/s. 10 m/s. 5 m/s. 2.5 m/s. none of the above

5 m/s

If a car increases its velocity from zero to 60 km/h in 10 s, its acceleration is 3 km/h ∙ s 6 km/h ∙ s 10 km/h ∙ s 60 km/h ∙ s 600 km/h ∙ s

6 km/h * s

A car accelerates from rest at 2 m/s2. What is its speed 3 s after the car starts moving? 2 m/s 3 m/s 4 m/s 6 m/s none of the above

6 m/s

An object is in free fall. At one instant, it travels at a speed of 50 m/s. Exactly 1 s later, its speed is about 25 m/s. 50 m/s. 55 m/s. 60 m/s. 100 m/s.

60 m/s.

In science, a theory is unchangeable. an educated guess. a synthesis of a large body of well-tested knowledge. an opinion.

A synthesis of a large body of well-tested knowledge.

It takes 6 s for a stone to fall to the bottom of a mine shaft. How deep is the shaft? about 60 m about 120 m about 180 m more than 200 m

About 180 m

Disregarding air resistance, objects fall at constant velocity. speed. acceleration. distances each successive second.

Acceleration

A truly educated person is knowledgeable about science. the arts. religion. all of the above

All of the above

Among those who charted the stars and planets in ancient times were Polynesians. Chinese. Arabians. all of the above

All of the above

An object in mechanical equilibrium is an object at rest. moving with constant velocity. having no acceleration. all of the above

All of the above

Compared with a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much inertia. mass. volume. all of the above none of the above

All of the above

When a loaf of bread rises, its density increases. decreases. stays the same

Decreases

The scientific method is most effective in making hypotheses. gaining, organizing, and applying new knowledge. discovering new things. making theories.

Gaining, organizing, and applying new knowledge.

The scientist to first introduce the concept of inertia was Aristotle. Galileo. Newton. Copernicus.

Galileo

When a cheating scientist reports fraudulent information, he or she as in many other professions, will be excused by the scientific community. gets no second chance in the scientific community. is elevated in the scientific community. none of the above

Gets no second chance in the scientific community.

The aurora borealis occurs in the lower atmosphere. in the upper atmosphere. mainly in semi-tropical regions. in cycles that match solar cycles

In the upper atmosphere

In each second of fall, the distance a freely falling object will fall is about 5 m. about 10 m. the same, but not 5 m or 10 m. increasing. none of the above

Increasing

A valid hypothesis must be more than an educated guess. capable of repeating by other investigators. testable. all of the above

Testable

In which of the following locations would a chunk of gold weighing 1 N have the largest mass? the Moon Earth the planet Jupiter

The Moon

Which of these is speculation rather than a scientific hypothesis? A full Moon is illuminated by starlight. There are things we will never know about. The planets move in square-shaped orbits about the Sun. The acceleration due to gravity decreases at high altitudes.

There are things we will never know about

Someone standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball to hit the ground below the cliff with the greatest speed will be the one initially thrown upward. downward. They will both hit with the same speed.

They will both hit with the same speed.

Galileo's interpretation of motion differed from Aristotle's in that Galileo emphasized the acceleration of free fall. time rates. the role of distance in describing motion. all of the above none of the above

Time rates

Which direction does a table push a book resting on it? up left right down

Up

As an object freely falls, its velocity increases. acceleration increases. both of the above none of the above

Velocity increases

When you stand at rest on a pair of bathroom scales, the readings on the scales will always each be half your weight. each equal your weight. add to equal your weight.

add to equal your weight.

Hang from a pair of gym rings and the upward support forces of the rings will always each be half your weight. each be equal to your weight. add up to equal your weight.

add up to equal your weight.

The classic scientific method includes observing carefully. questioning. predicting. all of the above

all of the above

Scientific thinking.. searches for cause-and-effect relationships. is rational thinking. both of these none of the above

both of these

Whereas Aristotle relied on logic in explaining nature, Galileo relied on observation. patterns. experiment. mathematics.

experiment

When a basketball player jumps to make a shot, once his or her feet are off the ground, the jumper's acceleration depends on launch speed. varies with body orientation. is usually greater for taller players (but not always). depends on all the above. is g, no more, no less.

is g, no more, no less.

A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water is greater for the dropped bullet. is greater for the fired bullet. is the same for each bullet. depends on how high they started. none of the above

is the same for each bullet.

Density is the ratio of weight to volume. mass to volume. mass to weight. weight to mass.

mass to volume.

While a car travels around a circular track at constant speed, its acceleration is zero. velocity is zero. both A and B none of the above

none of the above

Your weight is actually your mass. the gravitational attraction between you and the Earth. a property of mechanical equilibrium. all of the above none of the above

the gravitational attraction between you and the Earth.

An object weighs 30 N on Earth. A second object weighs 30 N on the Moon. Which has the greater mass? the one on Earth the one on the Moon They have the same mass. not enough information given

the one on the Moon

An apple falls from a tree and hits the ground 5 m below. It hits the ground with a speed of about 5 m/s. 10 m/s. 15 m/s. 20 m/s. not enough information given to estimate

10 m/s

If a freely falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s2, then its speed reading would increase each second by 10 m/s. 20 m/s. 30 m/s. 40 m/s. depends on its initial speed

20 m/s

Eratosthenes' measurements of Earth's size involved a deep well in Syene. a pillar's shadow in Alexandria. surveying the distance between Alexandria and Syene. all of the above

All of the above

Mathematics is useful in physics when relationships are studied. making scientific measurements. calculating trajectories of projectiles. all of the above

All of the above

Technology is a tool that can be socially beneficial. be socially harmful when abused. lead to a better world. all of the above

All of the above

The classic scientific method includes.. performing experiments. predicting the results of experiments. formulating general rules that organize findings. all of the above

All of the above

Which has zero acceleration? an object at rest an object moving at constant velocity an object in mechanical equilibrium all of the above none of the above

All of the above

A scientific law may begin as a hypothesis that is tested repeatedly and not contradicted. a large group of competent observers agree as true. both of these none of the above

Both of these

The two measurements necessary for calculating average speed are acceleration and time. velocity and time. distance and time. distance and acceleration. velocity and distance.

Distance and time.

Correct science is mainly linked to philosophical discussions. determination and belief in your abilities. experimentation. all of the above

Experimentation

A scientific idea that is well established and unquestionable is a.. valid hypothesis. fact of nature. both of these none of these

Fact of nature

One object has twice as much mass as another object, and also has twice as much inertia. velocity. gravitational acceleration. volume. all of the above

Inertia

Pseudoscience is a field of knowledge deservedly gaining a large following. wisdom only recently appreciated. both knowledge and wisdom. junk science

Junk Science

A ball is thrown upward and caught when it comes back down. In the presence of air resistance, the speed with which it is caught is more than the speed it had when thrown upward. less than the speed it had when thrown upward. the same as the speed it had when thrown upward.

less than the speed it had when thrown upward.