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Alik [6]
3 years ago
15

Please help me asappppp!!​

Physics
1 answer:
Reptile [31]3 years ago
6 0

Answer:

10.1

3.5

40.25

4.8

70

4.5

10.2

80

101.25

330. respectively

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If you sit on a skateboard and push against a brick wall, what would happen? Why do you think this?
Troyanec [42]

Answer:

well when if you are sitting down and then push off of the brick wall you will be backwards so you can't see anything so you might hit someone or something so you would have to be careful

Explanation:

the reason why i think this is because i have a brother who skateboard and he wants to help me get better and when we are just playing we sit down on the skateboard and push off things and ran into a pole because i was backwards and wasn't paying attention so that's why i think that

7 0
3 years ago
A 56-kg skater initially at rest throws a 5.0-kg medicine ball horizontally to the left. Suppose the ball is accelerated through
aniked [119]

Answer:

a_2=24.5\ \text{m/s}^2 towards right

a_1=2.1875\ \text{m/s}^2 towards left

Explanation:

m_1 = Mass of skater = 56 kg

m_2 = Mass of ball = 5 kg

v = Final velocity of ball = 7 m/s

u = Initial velocity of ball = 0

s = Distance the ball moved in the hand of the skater = 1 m

Moving left is considered and moving right is considered positive.

From kinematic equations of motion we have

v^2-u^2=2as\\\Rightarrow a=\dfrac{v^2-u^2}{2s}\\\Rightarrow a=\dfrac{7^2-0^2}{2\times 1}\\\Rightarrow a=24.5\ \text{m/s}^2

So, the ball will move towards right with a magnitude of acceleration a_2=24.5\ \text{m/s}^2.

The force on the ball will be

F_2=m_2a_2\\\Rightarrow F_2=5\times 24.5\\\Rightarrow F_2=122.5\ \text{N}

The force on the ball is 122.5\ \text{N}

The reaction force on the skater will be equal to the force on the ball but will have opposite direction.

-F_1=F_2\\\Rightarrow -m_1a_1=F_2\\\Rightarrow a_1=-\dfrac{122.5}{56}\\\Rightarrow a_1=-2.1875\ \text{m/s}^2

So, the skater will move towards left with a magnitude of acceleration 2.1875\ \text{m/s}^2

4 0
3 years ago
Which change will always result in an increase in the gravitational force between two objects? increasing the masses of the obje
abruzzese [7]

By definition, we have that the gravitational force is given by:

F = \frac{G * m1 * m2}{r ^ 2}

Where,

G: gravitational constant

m1: mass of object number 1

m2: mass of object number 2

r: distance between both objects.

Therefore, for the gravitational force to increase, the following conditions must be met:

1) Increase the mass of the objects so that the numerator of the equation is greater.

2) Decrease the distance between the objects so that the denominator of the equation is smaller.

Answer:

A change that will always result in an increase in the gravitational force between two objects is:

increasing the masses of the objects and decreasing the distance between the objects

4 0
3 years ago
Read 2 more answers
ANSWER ASAP PLEASEEE Kendra wonders what would happen if the oceans did not exist on Earth. Based on her understanding of the oc
Cloud [144]

Answer:

that there would be more clouds.

Explanation:

one of the cycles is precipitation. without water there would be no rain and clouds are what causes the rain to come down

7 0
3 years ago
Ron weighs a bottle with a mass of 0.5 kilograms on a spring scale. The spring stretches by 1 centimeter. He then weighs a secon
Yuri [45]

Answer:

1 kg

Explanation:

Applying,

Hook's law,

F = ke................. Equation 1

Where F = force, k = force constant of the spring, e = extension.

But from the question,

The weight of the bottle is the force acting on the spring scale

therefore,

mg = ke............ Equation 2

Where m = mass of the bottle, g = acceleration due to gravity.

make k the subject of the equation

k = mg/e............ Equation 3

Given: m = 0.5 kg, e = 1 cm = 0.01 m

Constant: g = 9.8 m/s²

k = (0.5×9.8)/0.01

k = 490 N/m

If the mass of the second bottle is weighed,

given: e = 2 cm = 0.02 m

subtitute into equation 1

m×9.8 = 490×0.02

9.8m = 9.8

m = 9.8/9.8

m = 1 kg.

Hence the mass of the second bottle is 1 kg

5 0
3 years ago
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