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3 years ago

20-kilogram canoe is floating downriver at 2 m/s. what’s the kinetic energy?

Physics

2 answers:

ziro4ka [17]3 years ago

6 0

Answer:

40J

Explanation:

Kinetic energy = 1/2 mv^2

Where m = mass and

v = velocity

Given mass = 20kg

v = 2m/s

K.E = 1/2 x 20 x2^2

= 1/2 x 20 x 2 x 2

= 80/2

= 40J

ryzh [129]3 years ago

3 0

To a physicist floating next to it in another canoe, its KE is zero.

To a physicist standing on the riverbank watching it go by, its KE is 40J.

They're both correct for their own reference frame.

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On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. Immediatel

Akimi4 [234]

Answer:48.2 Joules

Explanation:

Given

two masses of 0.2 kg and 0.4 kg collide with each other

after collision 0.2 kg deflect 30 north of east and 0.4 kg deflects 53.1 south of east

Velocity of 0.2 kg mass is

$v_{0.2}=12\cos (30)\hat{i}+12\sin (30)\hat{j}$

$|v_{0.2}|=11.99 m/s\approx 12 m/s$

Velocity of 0.4 kg mass

$v_{0.4}=13\cos (53.1)\hat{i}-12\sin (53.1)\hat{j}$

$|v_{0.4}|=12.99 m/s\approx 13 m/s$

Thus total Kinetic energy $=\frac{0.2\times 12^2}{2}+\frac{0.4\times 13^2}{2}$

Kinetic energy=48.2 J

8 0

3 years ago

A water tank is filled with water. What will be the pressure of the water when the level of the water is 6m?

Luden [163]

Answer:

pressure = density x g x height

= 1000 x 10 x 6 Pascal

=60000 Pascal

OR 60 kP

3 0

3 years ago

Read 2 more answers

What is the stopping distance if the car is initially traveling at speed 6.0v? assume that the acceleration due to the braking i

Sunny_sXe [5.5K]

The distance for any rectilinear motion at constant acceleration is:

d = v₀t + 0.5at²
where
v₀ is the initial velocity

So, if v₀ = 6v, and it stopped to 0 m/s, then the acceleration is equal to:
a = (0 - 6v)/t = -6v/t
Thus,
d = (6v)(t) + (0.5)(-6v/t)(t²)
d = 6vt - 3t
<span>d = 3t(2v - 1)</span>

4 0

3 years ago

rosijanka [135]

Answer:

its deepend on where you stand but. most cases g = 10 m/s²

W = M X G

W = 13 kg x 10 m/s²

W = 130 N

Explanation:

option b is correct brainlist ke

3 0

2 years ago

Explain why astronomers divide the sun into different layers.

strojnjashka [21]

Answer:

cause why not.

the layers exist cause theoretically the deeper you go the hotter it gets and different atoms just do stuff

8 0

2 years ago