Rank from greatest to least by how much they resist being set in motion: 10 kg of sand, 2kg iron, 12 kg water, and 4kg pillow.
water, sand, pillow, iron
Rank 10 kg sand, 2kg iron, 12 kg water, and 4kg pillow from greatest to least by the normal force the table exerts on the object
water, sand, pillow, iron
What is the net force when a pair of 5-N forces simultaneously act in the same direction on an object?
Consider a pair of forces, one having a magnitude of 20N and the other a magnitude of 12N. What maximum net force is possible for these two forces?
& the minimum possible net force?
32N & 8N
If you pull horizontally on a crate with a force of 200N, it slides across the floor in dynamic equilibrium. How much friction is acting on the crate?
The safest way for you to view the sun is with
an educated guess is:
The synthesis of a large collection of information that contains well-tested and verified hypotheses about certain aspects of the world is known as a scientific
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
Science and technology are
Henry Heavyweight weighs 1150N and stands on a pair of bathroom scales so that one scale reads twice as much as the other.
W1- 383 W2- 767
The scientist to first introduce the concept of inertia was
A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly.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
milk carton has inertia
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
A 300-kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is
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
A worker with a weight of 1500N stands on a 500N platform suspended at rest by two ropes. The tension in the first rope is measured to be 600N. What is the tension in the second rope?
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.
According to Newton's law of inertia, 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.
When a rocket ship accelerating in outer space runs out of fuel, it
no longer accelerates
Galileo's use of inclined planes allowed him to effectively
slow down the acceleration of free fall.
A 3. kg stone is dropped from rest at an unknown height and hits the ground 12.0 s later. What is the height?
Two forces F1 and F2 are acting on a 2kg block at rest on a frictionless surface. If F1 = 14N east and F2= 7N west, what is the magnitude of acceleration?
10N - 5N= 5N The box is moving 5N to the right ------->5N
A box is moving south on a level surface yet slowing down. What is the direction of the net force acting on it?
Homer initially driving along the road steps on the brake and it flies forward. This happens because?
the seat doesn't exert horizontal force on him
A person who says, "thats the only theory" likely doesnt know that a scientific theory is a?
synthesis of well tested hypothesis
Compared to a sound of 20DB a sound of 60 dB is ____ times intense
(10db) log (I/I0)= 10,000x
You are floating in the ocean, and waves with a wavelength of 10 m are causing you to bob up and down. If the waves are moving with s speed of 4m/s, what is your frequency of oscillation?
.4 cycles per sec
When the handle of a tuning fork is held solidly against a table, the sound becomes louder and the length of time the fork vibrates
Thermal convection applies mainly to
How would increasing the density of air in the atmosphere affect the amount of infrared radiation returned by the atmosphere back toward earth?
the amount of infrared radiation would increase
the higher the temperature of an object
the shorter the wavelengths it radiates
forces of 3.4N and 5.70N act at right angles on a block of mass 4.7kg. What is the magnitude of the block's acceleration?
1.41 m/s^2 --Fnet=m*a
A book is placed on a table. What is the reaction force to the weight of the book?
normal force, table exerts on the book
If a baseball bat delivers a blow of 20 N to a baseball in .900s, how much impulse is delivered to the ball?
A projectile is launched from the ground such that initially its horizontal velocity is 12 m/s and its vertical velocity is 5m/s. When the projectile is at its highest point above the ground, what is the magnitude of its velocity?
what happens to the gravitational force between two planets when the masses of both are quadrupled and their separation distance is doubled?
the force quadruples
An object is lifted from the surface of a spherical planet to an altitude equal to the radius of the planet. As a result, which of the following changes in properties of the object take place?
mass remains the same, weight decreases
How much time passes between low and high tides on the east coast?
A person walks 2 miles north and then turns around and walks 3 miles south. Total time elapsed = 1 hour.
Find: average velocity (vavg)
vavg = Δx/Δt = 1 mile / 1 hour = 1 mph
a 270kg bear grasping a vertical tree slides down at a constant velocity. What is the friction force between the bear and the tree?
An object is in equilibrium only if...
it has no acceleration & it moves with constant velocity
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