Question

1. Usain Bolt sprints along the track, with his feet pushing down and behind him. Therefore the track actually pushes Usain Bolt along the track. Group of answer choices True or False

2.You study two objects in motion, Object J and Object S. Each object has its own velocity graph, with same time and velocity scales. The slope of each graph is positive, upward and to the right ⁄ but Object J's tilt angle is only 10º and Object S's tilt angle is quite steep, 85º. Which statement below is unquestionably correct?

Hint: make two careful sketches on your scratch paper.

Group of answer choices

Object J gains a smaller amount of speed per second than S.

Object S is moving to the right.

Object S is moving at higher speed than Object J.

Object J is moving to the left.

3. The y-coordinate equation for a free-fall trajectory,

exemplifies an essential part of what scientists want to do:

Group of answer choices

control the discussion of ideas.

predict the future state of a physical system.

elect Galileo or other professor to an informal political office, King of All Sciences.

construct a history of mathematical understanding.

4. As the first actions in a basic study of motion in two dimensions, a scientist must set up a coordinate system and decide on ________.

Group of answer choices

whether to follow Galileo or Aristotle

an appropriate distance scale, meters vs. light years vs. nanometers

the best strategy to use, mathematics vs. music vs. pure logic.

which came first, the chicken or the egg

5.An object with *increasing* acceleration, like the one
we studied in lecture, does not in itelf, provide a true distance
rectangle or distance triangle on its velocity graph. However, the
area under the graph can be calculated, like in the film "Hidden
Figures," by using

Group of answer choices

the principle of the tortoise and the hare, i.e., average speed.

circular or parabolic arcs, just as the famous Euler Method uses.

Euler's Method, which Katherine Johnson invented.

many narrow trapezoids made of a rectangle and a triangle.

6.We say that the changes in velocity of the two skateboarders are unequal in size when

Group of answer choices

their Δ**v** vectors are equal in size and the same
direction.

their masses are not the same.

Newton’s third law says their interaction forces are the same size.

the time formula, d = (1/2)gt^{2}, is reversible.

7. The moon exerts a number of Newtons of gravitational force on
Earth: **F**_{(moon →Earth)}

The Earth exerts a number of Newtons of gravitational force on
the moon: **F**_{(Earth →moon)}

These two forces have the following relationship....

Group of answer choices

neither

both equal in size and opposite in direction

equal in size

opposite directions

8. Geosynchronous communication satellites orbit Earth every 24 hours, and they all orbit at the same altitude.

9.

You observe a coin at position x_{1} with velocity
**v**_{1} = 1.6 m/sec away from you, moving
toward point x_{2} on the x-axis, as shown.

The coin's mass is m = 0.005 kg.

There is a friction force of size f = 0.021 N that acts on it.

**Calculate the stopping acceleration on the
coin.**

Answer #1

1. The equation
Δ?=?0?+0.5??2Δx=v0t+0.5at2
Can be used to describe an object's position x. When can this
equation be applied?
Group of answer choices:
A. Displacement must be constant
B. The object must be acted on by no more than one force
C. Velocity must be constant
D. Acceleration must be constant
E. The force acting on the object must be gravity
2. If a vector A has a y component equal to
|?|cos?|A|cosθ, then the angle
?θ is the angle...

ch 6
1:
It is generally a good idea to gain an understanding of the
"size" of units. Consider the objects and calculate the kinetic
energy of each one.
A ladybug weighing 37.3 mg
flies by your head at 3.83 km/h
.
×10
J
A 7.15 kg
bowling ball slides (not rolls) down an alley at 17.5 km/h
.
J
A car weighing 1260 kg
moves at a speed of 49.5 km/h.
5:
The graph shows the ?-directed force
??...

do all five questions
Question 1
20 pts
Ignoring the effects of air resistance, if a ball falls freely
toward the ground, its total mechanical energy
Group of answer choices
increases
remains the same
not enough information
decreases
Flag this Question
Question 2
20 pts
A child jumps off a wall from an initial height of 16.4 m and lands
on a trampoline. Before the child springs back up into the air the
trampoline compresses 1.8 meters. The spring constant...

8 through 10 done please!!
3.13.6
Question 110 pts
A 319 kg motorcycle is parked in a parking garage. If the car has
35,494 J of potential energy, how many meters above ground is the
car? Report your answer to 1 decimal place. Please do not include
units or the answer will be marked incorrect.
Flag this Question
Question 210 pts
A box sitting on the top of a hill has 252 J of potential energy.
If the hill is...

just do questions 5 through 10
3.13.6
Question 110 pts
A 319 kg motorcycle is parked in a parking garage. If the car has
35,494 J of potential energy, how many meters above ground is the
car? Report your answer to 1 decimal place. Please do not include
units or the answer will be marked incorrect.
Flag this Question
Question 210 pts
A box sitting on the top of a hill has 252 J of potential energy.
If the hill...

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