Question

Science Help below

Answer 1

Displacement is distance combined with (1 point)
direction.
speed.
velocity.
magnitude.
2. The slope of the distance-time graph is equal to the (1 point)
speed.
acceleration.
displacement.
motion.
3. Acceleration is equal to (1 point)
distance divided by time.
change in speed divided by time.
the slope of the distance-time graph.
change in speed multiplied by time.
4. Which is not a force? (1 point)
friction
gravity
momentum
weight
5. What force besides gravity acts on a projectile? (1 point)
weak nuclear
electrical
magnetic
air resistance
6. Which of the following represents Newton’s second law? (1 point)
v = d/t
a = F/m
F = mv
F = 0
7. A resting object exerts pressure equal to (1 point)
its mass times its contact area.
its weight times its contact area.
its mass divided by its contact area.
its weight divided by its contact area.
8. The amount of water pressure you experience while swimming in a pool depends on (1 point)
your buoyancy.
the area of the pool.
the volume of the water in the pool.
how deep you are in the water.
9. Which of the following is NOT true about Bernoulli’s principle? (1 point)
The pressure within a moving fluid is greater than the pressure within a nonmoving fluid.
As a fluid’s speed increases, the pressure within it decreases.
When a moving fluid slows, the pressure within it increases.
It helps explain the lift of an airplane.
10. Work is the product of (1 point)
speed and force.
force and distance.
power and force.
motion and force.
11. Power is equal to work divided by (1 point)
time.
force.
distance.
mechanical advantage.
12. How is the work output of a machine related to its work input? (1 point)
It is always less.
It is always greater.
It is always equal.
It is always zero.
13. An example of an object having elastic potential energy is (1 point)
a stretched string.
books on a shelf.
a moving arrow.
a falling oyster.
14. Mechanical energy is (1 point)
found in machinery only.
usually measured at the atomic level.
the sum of the chemical and thermal energy of an object.
the sum of the kinetic and potential energy of an object.
15. The law of conservation of energy states that (1 point)
energy cannot be converted from one form to another.
energy cannot be created or destroyed.
energy resources must be used efficiently.
energy is constantly being lost to friction.
16. To heat 1 g of water by 1° C requires (1 point)
1 volt
1 Calorie
1 joule
1 watt
17. A blow dryer transfers thermal energy mainly by (1 point)
conduction.
convection.
radiation.
specific heat.
18. All engines operate at less than 100 percent efficiency because they (1 point)
absorb heat.
conduct heat.
burn gasoline.
emit heat.
19. Which of the following is NOT true about mechanical waves? (1 point)
They carry energy.
They transfer matter.
They can be longitudinal.
They require a medium.
20. The height of a wave crest is called (1 point)
wavelength.
frequency.
amplitude.
energy.