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4 years ago

What do velocity and acceleration have in common?

Physics

2 answers:

Allushta [10]4 years ago

8 0

Acceleration is the change in velocity

Igoryamba4 years ago

4 0

They both products of speed

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A 12-kg lead brick falls from a height of 1.9 m. (c) The brick falls onto a carpet, 2.0 cm thick. Assuming the force stopping it

Genrish500 [490]

Answer:

F = -11199.63 N

Explanation:

given,

mass of the brick = 12 Kg

height of the fall, h = 1.9 m

thickness of the carpet = 2 cm = 0.02 m

average force = ?

velocity of brick just before hitting mat

$v = \sqrt{2gh}$

$v =\sqrt{2\times 9.81\times 1.9}$

v = 6.11 m/s

velocity of brick just before hitting ground= 6.11 m/s

final velocity = 0 m/s

using equation of motion for acceleration calculation.

v² = u² + 2 a s

0² = 6.11² + 2x a x 0.02

$a = -\dfrac{6.11^2}{0.04}$

a =-933.3025 m/s²

now, average force is equal to

F = m a

F = 12 x (-933.3025)

F = -11199.63 N

negative sign represent the decelerating force.

8 0

3 years ago

A car movingin a straight line starts at x = 0 at t = 0. It passes the point x = 25.0 m with a speed of 11.0 m????s at t = 3.00s

makvit [3.9K]

Answer:

Part a)

at t = 3.00 s

$v = 8.33 m/s$

at t = 20.0 s

$v = 19.25 m/s$

Part b)

at t = 3.00 s

$a = 3.67 m/s^2$

at t = 20.0 s

$a = 2.25 m/s^2$

Explanation:

The car starts at x = 0

Part a)

Now at t = 3.00 s

the position of the car is given as x = 25 m and its speed is given as v = 11 m/s

Now for average velocity we have

$v = \frac{displacement}{time}$

$v = \frac{25 - 0}{3}$

$v = 8.33 m/s$

Now for average acceleration we have

$a = \frac{v - 0}{t}$

$a = \frac{11 - 0}{3}$

$a = 3.67 m/s^2$

Part b)

Now at t = 20.0 s

the position of the car is given as x = 385 m and its speed is given as v = 45 m/s

Now for average velocity we have

$v = \frac{displacement}{time}$

$v = \frac{385 - 0}{20}$

$v = 19.25 m/s$

Now for average acceleration we have

$a = \frac{v - 0}{t}$

$a = \frac{45 - 0}{20}$

$a = 2.25 m/s^2$

4 0

3 years ago

___________ is a force that opposes motion between two surfaces that are in contact

kobusy [5.1K]

Answer:

Friction

Explanation:

Friction can be simply defined as the force that creates resistance to any motion of a particular object that moves relative to another object. It occurs because of the electromagnetic force of attraction that is generated by the charged particles located between the two distinct contacting surfaces. It is a non-fundamental force.

This type of force is mainly responsible for the resisting of sliding and/or rolling of an object over the other one.

5 0

3 years ago

Read 2 more answers

from an origin you walk 3 meters east 7 meters west and then 6meters east . where are you now relative to the origin?

german

You take 3 steps east, turn around & take another 7 steps west (4 steps always from origin) you turn around again and take 6 more steps east - 2 steps always from origin

3 0

3 years ago

What is the current in a 120V circuit if the resistance 10?

densk [106]

Explanation:

V=IR; I=V/R

V=120V, R=10

I= 120/10=12

The current in the circuit is 12A

4 0

4 years ago