Physics 1310 Exam 1- gregory spencer

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

0

A skydiver steps from a helicopter and falls for a few seconds until he reaches his terminal velocity. Thereafter, until he opens his parachute, his acceleration is

0

When a falling object has reached its terminal velocity, its acceleration is

0

A 1 kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the stone when it is halfway to the top of its path is about

10 N

A push on a 1 kg brick accelerates with it. Neglecting friction, to Equally accelerate a 10 kg brick, one would have to push with

10 times as much force

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

100

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 m/s*s. What is the mass of the car?

1500 kg

If a free falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s*s, then its speed reading would increase each second by

20 m/s

A 1000-kg car enters a freeway on ramp at 20 m/s and accelerates uniformly up to 40 m/s in a time of 10 seconds. How far does the car travel during that time?

300 m

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

3000 N

A karate chop delivers a blow of 3000 N to a board that breaks. The force that acts on the hand during this event is

3000 N

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

3000 m/s

In science, an educated guess is a

Hypothesis

Which is a Scientific Statement?

Then moon is made of cheese

The synthesis of a large collection of info that contains well-tested and verified hypothesis about certain aspects of the world is know as a Scientific

Theory

A massive Mack truck and a lightweight Volkswagen traveling at the same speed have a head on collision. The vehicle that undergoes the greatest change in velocity will be the

Volkswagen

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

all three have different domains

If no external forces are acting on a moving object, it will

continue moving at same velocity

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

directed downward

A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is

equal to its weight

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

While ancient Greek philosopher Aristotle relied on logic and deep thought in explaining nature, the Enlightenment's Galileo relied on

experiement

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

follow a straight line path

The scientific method is most effective in

gaining, organizing, and applying knowledge

An object is mechanical equilibrium is an object

moving with constant velocity, having no acceleration, and at rest

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

no longer accelerates

Of the sciences, physics, biology, and chemistry, the most basic is

physics

As a ball falls, the action force is the pull of Earth on the ball. The reaction force is the

pull of the ball's mass on the Earth

The force exerted on the tires of a car to directly accelerate it along a road is exerted by the

road

The statement, "There are regions beneath the Earth's crust that will always be beyond the reach of scientific investigation," is a ___

speculation

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

the milk carton has inertia

A rock weighs 30 N on Earth. A second rock weighs 30 N on the moon. Which of the to has the greater mass?

the one on the moon

The attraction of a person's body toward Earth is called weight. The reaction to this force is

the person's body pulling on the Earth

Compared to the mass of a certain object on Earth, the mass of the same object on the moon is

the same

Drop a rock from a 5 m height and it accelerates at 10 m/s*s and strikes the ground 1 sec later. Drop the same rock from a height of 2.5 m and its acceleration of fall is about

the same amount

A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The force impact is

the same for both

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

velocity increases

When a rock thrown straight upwards gets to the exact top of its path, its

velocity is 0 and its acceleration is about 10 m/s*s

Compared to a 1 kg block of solid iron, a 2 kg block of solid iron has twice as much

volume, mass, inertia

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

wrong