John is riding a ski lift to the top of wildcat mountain. he removes his gloves and rapidly rubs his hands together to warm them up. what happens when john rubs his hands?
a.)the skin on his hands rapidly conducts heat, similar to metal.
b.)he traps heat between his hands because skin is an insulator.
c.)the particles in his hands vibrate faster because of friction.
d.)thermal energy moves from his fingertips to his palms.
e.) he simulates a fever that'll raise his core body temperature

Answer : (c) is correct option.

Explanation :

When he removes his gloves and rapidly rubs his hands together, he feels warmth in his hands.

This is because when he rubs his hands together, friction causes between them and the particles in our hands vibrate faster.

So, the correct option is (c) i.e. the particles in his hands vibrate faster because of friction.

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

i would say