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3 years ago

Plzzzz helppppppppppp

Physics

1 answer:

pashok25 [27]3 years ago

7 0

1. Explain, using Kinetic theory, why when you have a hot room, the room cools down when you open a window to the cold outside.

Answer:

According to kinetic theory of gases, at higher temperature, the molecules in air have higher kinetic energy and they are moving at a faster speed. Hence the pressure is greater. And Air moves from higher pressure to lower pressure.

In a hot room, the air pressure is greater. The cool air outside has lower pressure. On opening the window, Air moves from higher pressure to lower pressure, from outside to inside.

2. If an atom is 1*10^(-10) m wide, and the nucleus is 1*10^(-15) m wide, how wide would the atom be if the nucleus was scaled up to be 1 cm wide?

Answer:

When nucleus was scaled upto 1 cm, atom would be 10^(5) cm.

The question is pretty simple, we just have to scale the size of nucleus to larger value and get the size of atom accordingly.

We know that

when nucleus is 10^(-15) m => atom is 10^(-10) m

When nucleus becomes 1 m => atom is 10^(-10) * 10^(15) m = 10^(5) m

When nucleus is 1 * 10^(-2) => atom is 10^(5) * 10^(-2) m

When nucleus is 1 cm => atom is 10^(5) cm

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A piece of putty and a tennis ball with the same mass are thrown against a wall with the same velocity. Which object experiences

cluponka [151]

Answer:

Explanation:

Firstly, we have to define momentum.

Momentum is define as the product of mass and velocity.

That is P = mass×velocity

Also considering the third law of motion which states that: For every action, there is equal and opposite reaction.

Moreso, considering the 2nd law of motion which states that the rate of change in the momentum of a body is equal to the applied force and takes place in the direction of the applied force.

Now, applying P = mass×velocity

They both have same mass and velocity definitely, they will both experience same momentum.

Also from the question, the both share same velocity hence, the will both hit the wall with same velocity meaning the will both feel the same impact from the wall as well. Hence the third law of motion proves this right.

5 0

2 years ago

Freddie drives his car 10 km North. He stops for gas and then drives 5 km South.

fgiga [73]

Answer:

5 km

Explanation:

displacement is the straight line distance from a particular point. since north and south are in opposite directions, it means that he has taken a u-turn

thus, 10 - 5 = 5km displacement

4 0

2 years ago

A net force of 25N causes an object to accelerate at 4m/s^2. what is the mass of the object?

Doss [256]

Answer:

6.25 kg

Explanation:

Fnet=ma

m=Fnet/a

m=25/4

m=6.25kg

3 0

3 years ago

HELP the decay curve of twizzlers sheet!!!!!

Vinvika [58]

Ok so the first thing you need to do is im not gonna help you

7 0

2 years ago

A simple pendulum consists of a ball connected to one end of a thin brass wire. The period of the pendulum "is 2.51 s". The temp

Artyom0805 [142]

Answer:

0.0034 sec

Explanation:

L = initial length

T = initial time period = 2.51 s

Time period is given as

$T = 2\pi \sqrt{\frac{L}{g}}$

$2.51 = 2\pi \sqrt{\frac{L}{9.8}}$

L = 1.56392 m

L' = new length

ΔT = Rise in temperature = 142 °C

α = coefficient of linear expansion = 19 x 10⁻⁶ °C

New length due to rise of temperature is given as

L' = L + LαΔT

L' = 1.56392 + (1.56392) (19 x 10⁻⁶) (142)

L' = 1.56814 m

T' = New time period

New time period is given as

$T' = 2\pi \sqrt{\frac{L'}{g}}$

$T' = 2\pi \sqrt{\frac{1.56814}{9.8}}$

T' = 2.5134 sec

Change in time period is given as

ΔT = T' - T

ΔT = 2.5134 - 2.51

ΔT = 0.0034 sec

5 0

2 years ago