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Katena32 [7]
3 years ago
9

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
Physics
2 answers:
Anika [276]3 years ago
8 0
The particles in his hands vibrate faster because of friction. This is because on of that which is produced after friction is heat
UNO [17]3 years ago
4 0

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.

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You walk 45 m to the north, then turn 90° to your right and walk another 45 m How far are you from where you originally started?
docker41 [41]
C^2=a^2+b^2
c^2=45^2+45^2
c^2=4050
c=63.64
c=64
The answer is D.
3 0
4 years ago
Type the correct answer in the box. Round your answer to the nearest whole number. Calculate the man’s mass. (Use PE = m × g × h
Blababa [14]

Answer:

56 kg

Explanation:

The change in potential energy of the man is given by:

\Delta U = mg \Delta h

where

m is the man's mass

g is the gravitational acceleration

\Delta h is the change in height of the man

In this problem, we have:

\Delta U=4620 J is the gain in potential energy

g = 9.8 m/s^2 is the gravitational acceleration

\Delta h=8.4 m is the change in height

Re-arranging the equation and substituting the numbers, we find the mass:

m=\frac{\Delta U}{g\Delta h}=\frac{4620 J}{(9.8 m/s^2)(8.4 m)}=56 kg

6 0
3 years ago
Read 2 more answers
This i relatively easy but still, i attached a picture
bogdanovich [222]
Ultraviolet has a shorter wavelength than microwaves, so purple also has a shorter wavelength than red.

C is thus the answer
3 0
4 years ago
On a hot summer day several swimmers decide to jump into a river. They step off the bridge and strike the water at 1.5s later. I
Lilit [14]
The only equation you need is the Δy = v₀t + 1/2at², and in this case, v₀t = 0 because the swimmers are starting from rest. Therefore, Δy = 1/2at², and that is 1/2 x (10m/s²) x (1.5)² = 11.25m. 
With sigfigs it is 11m.
6 0
3 years ago
The same fluid flows through four different branching pipes. It enters each pipe from the left with the same speed, v0, and flow
Anvisha [2.4K]

Answer:

The correct option is A.

Explanation:

Following the equation of continuum, AV remains constant.

Case a

(3A)(V0) = AV1 + AV1 + AV1

3AV0 = 3AV1

V1 = V0

Case b

(A)(V0) = (A/3)V2 + (A/3)V2 + (A/3)V2 + (A/3)V2​​​​​​​

AV0 = 4V2/3

V2 = 3/4V0

Case c

(A/2)(V0) = AV3 + AV3 + AV3

AV0/2 = 3AV3

V3 = V0/6

Case d

(3A)(V0) = 2AV4 + 2AV4

3AV0 = 4AV4

V4 = 3V0/4

Comparing all the flow speeds, V1 is the largest.

Thus, the correct option is A.

6 0
3 years ago
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