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Shkiper50 [21]
2 years ago
13

A 3kg book falls from a shelf. If it lands with a speed of 4.8 m/s, from what height did it fall? A. 28.8 m , B. 1.2 m , C. 0.6

m , D. 14.1 m
Physics
1 answer:
Irina-Kira [14]2 years ago
7 0
The correct answer is B. 1.2 m (apex)
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If an object is rolling without slipping, how does its linear speed compare to its rotational speed?
RoseWind [281]

Answer:

v = rw

Explanation:

When an object is rolling continuously without slipping, then every angle it rotates through, is equal to a distance the perimeter has rotated.

If the object completes 10 revolutions and takes a particular time, let's say t to complete it. The angular distance would then be 20 π rad, while its angular velocity will be 20 π/t

The circumference will somehow translate to the distance it covers, which is 20πr, this means that the speed is 20πr/t

So, like the question asked, the linear speed compared to angular speed is

v : w

20πr/t : 20πt, which can be simplified to

r : 1

In essence, v = rw

3 0
3 years ago
Of the following is true about glass recycling
qwelly [4]
Recycling glass is an energy-saving practice
6 0
3 years ago
A baby carriage is sitting at the top of a hill that is 21 m high The carriage with the baby weighs 12 N
WITCHER [35]

Answer:E

=

252

J

Explanation:

The total mechanical energy of an object or system is given by:

E

m

e

c

h

=

K

+

U

Where

K

is the kinetic energy of the object and

U

is the potential energy of the object. The carriage, sitting motionless at the top of the hill, has only potential energy in the form of gravitational potential energy.

Gravitational potential energy is given by:

U

g

=

m

g

h

Where

m

is the mass of the object,

g

is the gravitational acceleration constant, and

h

is the height of the object above some specific reference point, in this case the ground

21

m

below.

The weight of a stationary object at the surface of the earth is equal to the force of gravity acting on the object.

W

=

→

F

g

=

m

g

We are given that the carriage weighs

12

N

, therefore

m

g

=

12

N

.

U

g

=

12

N

⋅

21

m

⇒

U

g

=

252

N

m

=

252

J

Answer link

Explanation:

5 0
3 years ago
our sun is a star that is fueled by a specific type of nuclear reaction. which type of nuclear reaction is this?
Akimi4 [234]

Answer:

the fusion of hydrogen nuclei or in other words "nuclear fusion"

Explanation:

4 0
1 year ago
It takes 700 joules to lift an object straight up, but 1400 joules to push it up a ramp, what is the
crimeas [40]

Answer:

561

Explanation: it would most definitely go down as a number because it isn't the same

3 0
2 years ago
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