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ella [17]
3 years ago
12

ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements. An object on earth ha

s a mass of 4 kg. Calculate its weight on another planet that has an acceleration due to gravity one-half that of the earth. w2 = N
Physics
1 answer:
kirza4 [7]3 years ago
8 0

Answer:

19.6 kg*m/s^2 = 19.6 N

Explanation:

Weight is mass times acceleration due to gravity.  And hopefully you know that acceleration due to gravity on earth is 9.8 m/s^2  So what is half of that?  4.9.  So now the calculation is super simple.

mass = 4 kg and acceleration = 4.9 m/s^2 so now we multiply these two numbers and get 19.6 kg*m/s^2.  kg*m/s^2 is also known as Newtons, abbreviated with an N so the final result is 19.6 N.  

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A skateboarder rolls off a 2.5 m high bridge into the river. If the skateboarder was originally moving at 7.0 m/s, how much time
saul85 [17]

Answer:

  t = 0.714 s and  x = 5.0 m

Explanation:

This is a projectile throwing exercise, in this case when the skater leaves the bridge he goes with horizontal speed

         vₓ = 7.0 m / s

Let's find the time it takes to get to the river

         y = y₀ + v_{oy} t - ½ g t²

the initial vertical speed is zero and when it reaches the river its height is zero

        0 = y₀ + 0 - ½ g t²

        t = \sqrt{\frac{2y_o}{g}  }

        t = ra 2 2.5 / 9.8

        t = 0.714 s

the distance traveled is

       x = vₓ t

       x = 7.0 0.714

       x = 5.0 m

3 0
3 years ago
Balance the following equations: CUCO3+H2SO4- CUSO4+H2O+CO2​
Setler79 [48]

Answer:

It is already balanced

Explanation:

It is already balanced

6 0
3 years ago
Two Mississippi companies, Howard Industries and Kuhlman Electric Company, are responsible for most of the transformers and powe
yanalaym [24]
I  think b but  im not sure just helping

5 0
3 years ago
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Is a computer an open or closed system
soldier1979 [14.2K]

Answer:

OPEN

Explanation:

7 0
3 years ago
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A 54 kg man holding a 0.65 kg ball stands on a frozen pond next to a wall. He throws the ball at the wall with a speed of 12.1 m
Inessa [10]

Answer:

The velocity of the man is 0.144 m/s

Explanation:

This is a case of conservation of momentum.

The momentum of the moving ball before it was caught must equal the momentum of the man and the ball after he catches the ball.

Mass of ball = 0.65 kg

Mass of the man = 54 kg

Velocity of the ball = 12.1 m/s

Before collision, momentum of the ball = mass x velocity

= 0.65 x 12.1 = 7.865 kg-m/s

After collision the momentum of the man and ball system is

(0.65 + 54)Vf = 54.65Vf

Where Vf is their final common velocity.

Equating the initial and final momentum,

7.865 = 54.65Vf

Vf = 7.865/54.65 = 0.144 m/s

4 0
3 years ago
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