Question

Please answer all questions thanks.

(1) A ball is thrown vertically up into the air. You know that the ball rises while slowing down, then it is for a moment at rest, then it speeds back up while it heads down toward the ground. At the moment in time when the ball is at its very highest point in the trajectory, the net force on the ball is ...

Group of answer choices

a. zero because the ball is at rest.

b. the weight force on the ball.

c. the inertia of the ball down.

d. the mass of the ball down.

(2) A ball is thrown vertically up into the air. You know that the ball rises while slowing down, then it is for a moment at rest, then it speeds back up while it heads down toward the ground. At the moment in time when the ball is at its very highest point in the trajectory, the acceleration of the ball ...

Group of answer choices

a. is zero because the ball is at rest at that moment.

b. is 9.8 m/s/s.

c. depends on how heavy is the ball.

d. is 9.8 m/s/s down.

(3) The total thrust of the engines on a jet airplane is 8.8 *
10^{5} N. If the acceleration of this plane is 2.9 m/s/s,
what is the mass of the plane?

Group of answer choices

a. 3.0 * 10^{5} kg

b. 4.4 * 10^{5} kg

c. 4.7 * 10^{5} kg

d. 2.7 * 10^{5} kg

(4)A 1200 kg car has become stalled on an icy patch of flat
horizontal road. Two ropes are attached to it and they exert forces
of F_{1}=800 N at 35^{o} North of East, and
F_{2}=600 N at 25^{o} South of East. What is the
acceleration of the car if there is no friction?

Take East to be represented by and North to be represented by .

Group of answer choices

m/s/s

m/s/s

m/s/s

m/s/s

Answer #1

Imagine that you throw a tennis ball vertically into the air. At
the exact top of its trajectory it is at rest. What is the
magnitude of its acceleration at this point?
I know that the answer is 9.8 m/s^2 but I want an explanation in
terms of Physics please.

A ball thrown vertically upward is caught by
the thrower after 1.98 s.
Find the initial velocity of the ball. The
acceleration of gravity is 9.8 m/s2 .
Answer in units of m/s.
002 (part 2 of 2) 10.0 points
Find the maximum height it reaches.
Answer in units of m.
003 (part 1 of 2) 10.0 points
A car is traveling at 42.3 km/h on a flat
highway.
The acceleration of gravity is 9.81 m/s2 .
a) If the...

URGENT
A ball is thrown vertically upward from the edge of a cliff,
with an upward velocity of 20 m/s. On its way back down, it just
misses the end of the cliff.
(a) Find the position and velocity of the ball 1 s and 4 s
after it is thrown;
(b) Find the velocity of the ball when it is 5 m above the
flat surface of the cliff. Write the magnitude of the velocity in
the Answer box...

A ball is thrown vertically upward from the edge of a cliff,
with an upward velocity of 20 m/s. On its way back down, it just
misses the end of the cliff.
(a) Find the position and velocity of the ball 1 s and 4 s
after it is thrown;
(b) Find the velocity of the ball when it is 5 m above the
flat surface of the cliff. Write the magnitude of the velocity in
the Answer box below...

ANSWER QUESTIONS 1-3 PLEASE!!!
1. A snowball that is 178 grams fall to the ground. It hits the
floor with a speed of 5.42 m/s, bounces, and leaves the floor
(going vertically up) with a speed of 3.16 m/s. Determine the
magnitude of the impulse given to the ball while it was in contact
with the ground.
2. A vehicle has a mass of 1,240 kg and a velocity of 22.4 m/s
northward, and another vehicle has a mass of...

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...

1. Imagine tossing a ball of mass "m" into the air and watching
it fall down. What are the magnitude and direction of the velocity
and acceleration while the ball is in the air: a) on the way up? b)
at the top? and c) on the way down (but not yet hitting the
ground)? Please ignore the issue of air friction in this essay.
(You can draw if you want to!)(Answer this question
conceptually)
2. A jogger accelerates from...

1. A car speeds up from 15 m/s to 35 m/s in a time of 5.0 s.
What is its acceleration?
2. A 20-kg crate slides along a rough horizontal floor. The
coefficients of friction between the crate and the floor are
μs max =0.5, and μk =0.25. How strong is the
friction force that acts on the crate as it slides
across the floor?
3. A man pushes a 100-kg couch across a carpeted floor. As he
pushes, the...

For Each Question:
- Mark As True or False
- Give Reason
- Prove Your Answer By An Example
1. The magnitude of the average velocity is not the average
speed.
2. The magnitude of the instantaneous velocity is the
instantaneous speed.
3. The word deceleration means always slowing down.
4. The acceleration of a projectile at the top of its
trajectory is zero. While the velocity at the top of the motion of
an object thrown upward momentarily goes...

A ball rolls onto the path of your car as you drive down a quiet
neighborhood street. To avoid hitting the child that runs to
retrieve the ball, you apply your brakes for 1.14 s. The car slows
down from
14.5î + 4.50
m/s to
8.25î + 3.50
m/s.
The mass of the car is 1.21 103 kg.
(a) During the time the brakes were applied, what was the
average force exerted on your car? Express your answer in vector
form....

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