Ask question

Ask question

All categories

3 years ago

7

After running, your friend lies down on a tile floor because he says the "coolness" of the tile transfers to his body. Is this s

tatement true or false?
This is true because the coolness of the tile will transfer to his body.

This is false because the warmth of his body will transfer to the cool tiles.

1 answer:

GrogVix [38]3 years ago

4 0

Answer:

oh this is tricky

Explanation:

this is false because the warmth of his body will transfer to the cool tiles

You might be interested in

Sort out electric current as fundamental or derived unit.

Gemiola [76]

Answer:

electric current is derived unit.

Explanation:

According to the definition of electric current, it appears to be a derived quantity. Charge on the other hand seems more fundamental than electric current.

7 0

3 years ago

Read 2 more answers

Two ponies of equal mass are initially at diametrically opposite points on the rim of a large horizontal turntable that is turni

AleksandrR [38]

Answer:A

Explanation:

Given

Two ponies are at Extreme end of turntable with mass m

suppose turntable is moving with angular velocity $\omega$

Moment of inertia of Turntable and two ponies

$I=I_o+2mr_0^2$

let say at any time t they are at a distance of r from center such $r$

Moment of inertia at that instant

$I'=I_0+2mr'^2$

$I'$

conserving angular momentum as net Torque is zero

$I\omega =I'\omega '$

$\omega '=\frac{I}{I'}\times \omega$

$\omega '>\omega$

Thus we can say that angular velocity increases as they move towards each other.

3 0

3 years ago

A helicopter lifts a 72 kg astronaut 15 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/

NemiM [27]

Answer:

a) $F_H=776.952\ N$

b) $F_g=706.32\ N$

c) $v=5.4249\ m.s^{-1}$

d) $KE=1059.48\ J$

Explanation:

Given:

mass of the astronaut, $m=72\ kg$

vertical displacement of the astronaut, $h=15\ m$

acceleration of the astronaut while the lift, $a=\frac{g}{10} =0.981\ m.s^{-2}$

a)

<u>Now the force of lift by the helicopter:</u>

Here the lift force is the resultant of the force of gravity being overcome by the force of helicopter.

$F_H-F_g=m.a$

where:

$F_H=$ force by the helicopter

$F_g=$ force of gravity

$F_H=72\times 0.981+72\times9.81$

$F_H=776.952\ N$

b)

The gravitational force on the astronaut:

$F_g=m.g$

$F_g=72\times 9.81$

$F_g=706.32\ N$

d)

Since the astronaut has been picked from an ocean we assume her initial velocity to be zero, $u=0\ m.s^{-1}$

using equation of motion:

$v^2=u^2+2a.h$

$v^2=0^2+2\times 0.981\times 15$

$v=5.4249\ m.s^{-1}$

c)

Hence the kinetic energy:

$KE=\frac{1}{2} m.v^2$

$KE=0.5\times 72\times 5.4249^2$

$KE=1059.48\ J$

8 0

3 years ago

Read 2 more answers

A smallish SUV of mass 750kg runs into the back of my subcompact 400kg car at 2 m/s while I am stopped at an intersection. He sm

Naily [24]

Explanation:

Below is an attachment containing the solution.

5 0

3 years ago

Do stars that look brighter in the sky have larger or smaller magnitudes than fainter stars?

alina1380 [7]

Answer:

Stars that have lower apparent magnitudes have more brightness.

Explanation:

Greek astronomer Hipparchus devised a system of arranging the luminosity of stars with their apparent magnitude. The brightest stars were in the first magnitude class, and the dimmer stars were in the latter magnitude classes.

Later in the 19th century technology had developed to accurately measure a star's brightness. It was established that a factor of exactly 100 times in intensity was due to difference of 5 magnitudes.

8 0

4 years ago