When an object falls through air, there is a drag with dimensions ml/t2 that depends on the ________. 1) size of the object 2) mass of the object 3) velocity of the object 4) density of the air

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Answer 1

Answer: When an object falls through air, the drag with dimensions $mL/t^2$ depends on the 1) size of the object, 2) velocity of the object, and 4) density of the air.

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A scientist on Earth drops a hammer and a feather at the same time, and an astronaut on the moon drops a hammer and a feather. Which statement is true? a) The feather falls faster on Earth. b) The hammer falls faster on the moon. c) The feather falls faster on the moon. d) The hammer and feather fall at the same rate on the moon.

Answers

I think it is d because no matter what object you do, no matter the mass, they will fall at the same time. I think this may happen because of gravity.

Hope this helps!

A student pedaling a bicycle applies a net force of 400 N. The mass of the rider and the bicycle is 25 kg. What is the acceleration of the bicycle and the rider?

Answers

The acceleration is $16 m/s^2$

Explanation:

We can answer this question by using Newton's second law, which states that the net force acting on an object is equal to the product between the mass of the object and its acceleration:

$F=ma$

where

F is the force

m is the mass

a is the acceleration

In this problem, we have

m = 25 kg is the mass of the rider+bicycle

F = 400 N is the force

Solving for a, we find the acceleration:

$a=(F)/(m)=(400)/(25)=16 m/s^2$

Learn more about Newton's second law:

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Answer:

The acceleration is

Explanation:

We can answer this question by using Newton's second law, which states that the net force acting on an object is equal to the product between the mass of the object and its acceleration:

where

F is the force

m is the mass

a is the acceleration

In this problem, we have

m = 25 kg is the mass of the rider+bicycle

F = 400 N is the force

Solving for a, we find the acceleration:

The si unit of work is called

Answers

The SI unit of work is known as the joule which is represented by J.

What is the momentum of a 2-kg toy truck that moves at 10 m/s

Answers

p=mv
p=(10)(2)
p=20 kg*m/s

A person can jump a maximum horizontal distance (by using a 45◦ projectile angle) of 5 m on Earth. The acceleration of gravity is 9.8 m/s 2 . What would be his maximum range on the Moon, where the free-fall acceleration is g 6 ? Answer in units of m

Answers

Answer:30 m

Explanation:

Given

Maximum Horizontal distance is 5 m on earth

launching angle $=45^(\circ)$

Acceleration due to gravity on earth is $9.8 m/s^2$

Acceleration due to gravity on moon is $(9.8)/(6)=1.63 m/s^2$

Range of projectile is given by

$R=(u^2\sin 2\theta )/(g)$

$R_(earth)=(u^2\sin 2\theta )/(g)=5$ ----1

$R_(moon)=(u^2\sin 2\theta )/((g)/(6))$ -----2

Divide 1 & 2

$(5)/(R_(moon))=(1)/(6)$

$R_(moon)=30 m$

Air is made of 80% nitrogen and 20% oxygen by volume. The densities of air and oxygen is 1.29kgm^-3 and 1.43kgm^-3 respectively. What is the density of nitrogen? Please specify your soultion,thank you!

Answers

Volume % = mole %

Molar mass of oxygen = 32kg/kmol

Molar mass of nitrogen = 28 kg/kmol

Density of nitrogen = Density of oxygen x molar mass of oxygen x molar ratio of air x molar mass of nitrogen

Density of nitrogen = (1.43kgm^-3)(1 kmol O2/32 kg O2)(80 kmol N2/ 20 kmol O2)(28 kg N2/1 kmol O2) = 5.01 kg/m3

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