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Reika [66]
3 years ago
12

How much work did he do if he traveled 20 meters?

Physics
1 answer:
scZoUnD [109]3 years ago
7 0
A lot sndndnsndndndndnndndndnd
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A rolling (without slipping) hoop with a radius of 0.27 m and a mass of 1.80 kg climbs an incline. At the bottom of the incline,
Irina-Kira [14]

Answer:

Explanation:

Angular speed of hoop ω = v / r

= 8.90 / .27

= 32.96 rad / s

Translational kinetic energy = 1/2 mv²

= .5 x 1.8 x 8.9²

= 71.29 J

Rotational kinetic energy = 1/2 Iω²

= 1/2 mR²x ω²

= 1/2 mv²

= 71.29 J

Total kinetic energy

= 2 x 71.29

= 142.58 J

This energy will be used to attain height

If h be the height attained

mgh = 142.58

h = 142.58 / mg

= 142.58 / 1.8 x 9.8

= 8.08 m .

6 0
3 years ago
A physics professor uses an air-track cart of mass m to compress a spring of constant k by an amount x from its equilibrium leng
zhenek [66]

Answer:

        v = √k/m    x

Explanation:

We can solve this exercise using the energy conservation relationships

starting point. Fully compressed spring

        Em₀ = K_{e} = ½ k x²

final point. Cart after leaving the spring

        Em_{f} = K = ½ m v²

        Em₀ = Em_{f}

        ½ k x² = ½ m v²

        v = √k/m    x

6 0
4 years ago
A rocket of mass m is to be launched fromplanet X, which has a mass M and a radius R. What is the minimum speed that the rocket
Sunny_sXe [5.5K]

Answer:

The minimum speed = \sqrt{\frac{2GM}{R} }

Explanation:

The minimum speed that the rocket must have for it to escape into space is called its escape velocity. If the speed is not attained, the gravitational pull of the planet would pull down the rocket back to its surface. Thus the launch would not be successful.

The minimum speed can be determined by;

                      Escape velocity = \sqrt{\frac{2GM}{R} }

where: G is the universal gravitational constant, M is the mass of the planet X, and R is its radius.

If the appropriate values of the variables are substituted into the expression, the value of the minimum speed required can be determined.

7 0
3 years ago
You have seen that two objects with opposite charges attract each other, and two objects with the same charge repel each other.
Vesna [10]

Answer:

it should attract.........

6 0
3 years ago
When you see a flat line on a position vs. time graph, what is the slope of this line? What does this tell you about motion of t
qwelly [4]

Answer:

The slope of the line is zero

The object is at rest

Explanation:

The graph position vs time of an object represents the position of the object measured at different times.

The slope of this graph is given by:

m=\frac{\Delta y}{\Delta x}

where

\Delta y is the increment in the y-variable

\Delta t is the increment in the x-variable

However, we have that:

\Delta y corresponds to \Delta r, the change in position of the object

\Delta x corresponds to the change in time, \Delta t

Therefore, for a position-time graph the slope of the graph corresponds to the velocity of the object:

m=\frac{\Delta r}{\Delta t}=v

An object having a flat line on a position-time graph has a line with slope zero: therefore, its velocity is zero, and this means the object is at rest.

6 0
4 years ago
Read 2 more answers
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