Question

1.If a car's speedometer indicates a
constant speed of 30 miles per hour, can it be

say that the car is not accelerating?

2. Describe an example of something that has constant speed and at
the same time a

variable speed. Can you describe an example of something that has a
constant speed

and variable speed? Sustain your answers.

3.Describe an example of a
body experiencing acceleration when traveling rapidly

constant. Is it possible to describe an example of a body
under-acceleration traveling

at constant speed? Explain.

4. Can an object increase its speed if its acceleration decreases?
If so, give an example. If not, explain.

5. Can you have zero speed and nonzero
average acceleration? And acceleration

zero and non-zero speed? Explain, using a graph vx versus t and
give an example

of that movement.

6. If the initial position and speed of a vehicle are known and
acceleration is recorded

at every moment, can its position be calculated after a certain
time with this data?

If you can, explain how.

7. Galileo studied uniform
acceleration by rolling a series of

inclined ramp balls. It noted that a ball starting from rest would
travel 1, 3, 5, 7, 9, etc.

units away for successive equal time intervals. Explain that
this

observation is consistent with the budget that there is constant
acceleration.

8. You throw a ball vertically
upwards, the magnitude of the acceleration of the ball, in

each of the following moments is greater than g, of the same
magnitude as g, less

g or zero? Explain.

a) Just after leaving your hands

b) At its maximum height

c) Before touching the ground.

9. From the roof of a skyscraper, you
throw a ball vertically upwards with

rapidest v0 and a ball directly down quickly v0. a) Which ball has
the greatest

rapid when it reaches the ground? b) Which one gets to the ground
first? c) Which one has a greater

displacement when it reaches the ground? d) Which travels the
longest distance when it reaches the

floor?

10. Demonstrate the following. a) As
long as the effects of air may be disregarded, if

is throwed vertically upwards it will have the same speed when it
returns to the point of

launch that when released. b) The flight time will be twice the
upload time.

Answer #1

A car is moving horizontally with constant acceleration of a=1
ms^-2.At an instant,when speed of car is 2ms^-1 a boy standing upon
car,throws a small ball with 5 ms^-1 vertically upwards.The ball
falls on the ground on the position.....

Ball 1 and Ball 2 are initially at rest at ground level. At t =
0 Ball 1 is launched vertically upward with an initial speed V0.
One second later Ball 2 is launched vertically upward with the same
initial speed V0. Neither ball reaches its maximum height until
several seconds after the second ball is launched.
1)
Ignoring any effects due to air resistance, which of the
following statements best describes the distance between the balls
after the second...

You are in a car (car A) traveling at a constant speed of 72 mph
(miles per hour) when another car (car B) 25 meters ahead of your
swerves into your lane. Car B is traveling at 100 km/hr. In order
to avoid colliding with car B, determine the minimum acceleration
of your car (A).
a) For both cars, sketch acceleration- and velocity-versus-time
graphs. (Be sure to label them.) When sketching a graph, you should
show the rough behavior (i.e.,...

Se
tira una bola verticalmente hacia arriba, la magnitud de la
aceleracion de la bola, en cada uno de los siguientes instantes es
major que g, de la misma magnitud que g, menos qje g o cero?
Explique. a) justo despues de salir de sus manos b) en su altura
máxima c) antes de tocar el suelo
You
throw a ball vertically upwards, the magnitude of the acceleration
of the ball, in each of the following moments is greater than...

When you throw a ball horizontally, the
vertical component of the ball’s speed ...
A. continuously increases.
B. remains zero.
C. continuously decreases.
D. first decreases and then increases.
E. remains constant
When you throw a ball horizontally, the
horizontal component of the ball’s speed ...
A. remains constant.
B. remains zero.
C. continuously increases.
D. continuously decreases.
E. first decreases and then increases.
I know the answers are both A, but can someone explain why??

You throw a tennis ball North with an initial speed of 24 feet
per second, at an angle of elevation 30° above horizontal,
releasing the ball 4 feet above the ground. A steady wind imparts a
constant acceleration of 3 feet per second squared Eastward.
Acceleration due to gravity is a constant 32 feet per second
squared downward.
Throughout the problem, let East be the positive x
direction, North the positive y direction, and up the
positive z direction. Let...

You drop a package from an airplane flying at a constant speed
in a straight horizontal line. From the same height and time, one
red ball is dropped and another blue ball is fired horizontally.
The air resistance can be neglected. Which will hit the ground
first, the package, the red ball, or the blue ball?
Include an explanation!

Question 6 (1 point)
Saved
Using a spreadsheet, find the slope of the trendline that runs
between the following points where each datapoint records
(time,speed):
(0.1 , 8) , (0.2 , 7) , (0.3 , 6) , (0.4 , 4) , (0.5 , 2) , (0.6
, 1)
Question 6 options:
A)
11.2
B)
5.78
C)
-4.62
D)
-14.9
Procedure 4: Throw Ball Upwards
Throw your ball upwards (If you're inside, be careful. If you're
outside, be careful.)Observe the speed...

Question:
You stand at the bottom of a long ramp (i.e. one used for
wheelchair access) and throw a tennis ball towards the top of the
ramp, as shown in the sketch. Assume that the tennis ball leaves
your hands a height h = 1.800 m from the ground and at a
speed of v0 = 14.00 m/s and an angle of
elevation of 51.03°, as shown in the sketch. Take the origin of a
Cartesian coordinate system on the...

You are driving on a country road at a constant speed
v0, which is above the speed limit. You pass a
policeman behind a billboard. He turns on his lights and siren,
which takes a time T, then accelerates toward you with
constant acceleration a. How far beyond the billboard are
you when the policeman catches up with you?
This police car cannot travel at a speed greater than twice
yours, that is, 2v0. Under what condition will
that make...

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