physic 1305

A 300kg (mass) bear grasping a vertical tree slides down at constant velocity. This friction force between the tree and the bear is

3000 N

Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration in meters per second per second?

4.0

In science, an educated guess is a

hypothesis

If your automobile runs out of fuel while you are driving, the engine stops but you do now come to an abrupt stop. The concept that most explains why is

inertia

The language of science is

mathematics

Twelve seconds after starting from rest, and object falling freelyl will have a speed of

more than 100 m/s

When a rocket ship accelerating in outer space runs out of fuel, it

no longer accelerate

Of the sciences known as physics, chemistry, biology, the most basic is

physics

If a rocket initially at rest accelerates at a rate of 50 m/s2 for one minute, its speed will be

3000 m/s

The easiest way for you to measure the distance between the earth and the moon is to place in your line of sight to the moon a:

Coin

The scientist to first introduce the concept of inertia was

Galileo

A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always

directed downward

Somebody who says, " that only theory" likely doesn't know that a scientific theory is

a vast synthesis of well-tested hypotheses and facts

It takes 6 seconds for a stone to fall to the bottom of a mine shaft. how deep is the shaft?

about 180m

A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is

about 30 m/s

Disregarding air resistance, objects fall with constant

acceleration

Hang from a pair of gym rings and the upward support forces of the rings will always

add up to equal your weight

Science, art, and religion do not contradict one another because

all have different domains

An object in mechanical equilibrium is an object: a) at rest b) moving with constant velocity c) having no acceleration d) all the above

all the above

If an object moves with constant acceleration, its velocity must

change by the same amount each second

Eratoshenes learned about the position of the sun on June 22 by

consulting library information

If no external forces (EF=0) are actin on a moving object, it will

continue moving at the same velocity

A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor

exactly below the midpoint of the ceiling

Whereas Aristole relied on logic in explaining nature, Galileo relied on

experiments

Drop a rock from 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

the same amount

Starting from rest, the distance a freely falling object will fall in 0.5 second is about

none of above

While a car travels around a circular track at a constant speed, its: a) acceleration is zero b) velocity is zero c) inertia is zero d) none of the above

none of the above

A horse gallops a distance of 10 kilometers in a time of 30 mintues. Its average speed is

20 km/h

If a freely falling object were some how equipped with a speedometer on a planet where the acceleration due to gravity i s 20 m/s, then its speed reading would increase each second by

20 m/s

A care accelerates at 2 meters per second per second. Assuming the care starts from rest, how much time does it need to accelerate to speed of 30 m/s?

15 seconds

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

10 N

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by about

10 m/s

A car accelerates at 2 meters/s/s. Assuming the care starts from rest, how far will it travel in 10 s?

100m

At one instant a heavy object in air is moving upward at 50 meters per second. One second later its speed is approximately

40 m/s

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

400 N

One half second after starting from rest, a freely falling object will have a speed of about

5 m/s

If a car accelerates from rest at 2 meters per second per second , its speed 3 seconds later will be about

6 m/s

At one instant an object in free fall is moving downward at 50 meters per second. One second later its speed should be about

60 m/s

Which of the following is scientific statement?

The moon is made of green cheese

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that

the milk carton has inertia

The synthesis of a large collection of information that contaings well-tested and verified hypothesis about certain aspects of the world is known as a scientific

theory

Galileo's interpretation of motion differed from Aristole's in that Galileo emphasized

time rates

Wile an object near the Earth's surface is in free fall, its

velocity increases

A scientific hypothesis may turn out to be right or it may turn out to be wrong. If it is a valid hypothesis, there must be a test for proving it

wrong

A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is

zero

According to Newton's law of inertiaa, a railroad train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains

always have forces that oppose their motion

Science is a body of knowledge that : a) describes order in nature b) is an ongoing activity of humans c) condenses knowledge into testable laws d) all of the above are correct e) none of the above are correct

d) all of the above are correct

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to

follow a straight line path

Science and technology are

fundamentally different from each other

the scientific method is most effective in

gaining, organizing, and applying new knowledge

When a scientist is dishonest and reports false information, he or she:

gets no second chance in the scientific community

In science, facts

may change