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lbvjy [14]
3 years ago
12

You are rolling on a skateboard with a constant velocity of 12 m/s. As you are moving you toss a baseball straight up into the a

ir with a vertical speed of 25 m/s. How long will it take the ball to land back in your hand? How high will the ball go before it falls back down?
Physics
1 answer:
Aliun [14]3 years ago
5 0
Ick! Word problems! They suck. Okay so first of all you want to narrow it dow the equation.


Step 1. What are the numbers? (In this case 12 m/s and 25 m/s)

Step 2. Are you multiplying, dividing? (In this case your dividing)

Step 3. Divide.

I hope that helps.
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Concept map for kinetic energy, work and power
Helen [10]

Kinetic energy: the energy of motion

Work: the change in kinetic energy

Power: the rate of work done

Explanation:

The kinetic energy of an object is the energy possessed by the object due to its motion. Mathematically, it is given by:

K=\frac{1}{2}mv^2

where

m is the mass of the object

v is its speed

The work done an object is the amount of energy transferred; according to the energy-work theorem, it is equal to the change in kinetic energy of an object:

W=K_f - K_i

where

K_f is the  final kinetic energy

K_i is the initial kinetic energy

Finally, the power is the rate of work done per unit time. Mathematically, ti can be expressed as

P=\frac{W}{t}

where

W is the work done

t is the time elapsed

Learn more about kinetic energy, work and power:

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8 0
3 years ago
2. Four resistors of 2 ohm each are connected first in series and then in parallel with a battery.Find the ratio of electric cur
Serjik [45]

Answer:

Ratio of series current to parallel

= 1 : 8

Explanation:

Total resistance Rt

For series, Rt = 2+2+2+2 = 4ohms

For parallel, 1/Rt = 1/2 + 1/2 + 1/2 + 1/2

1/Rt = 4/2, Rt = 2/4 ohms.

If we use a 1V battery, then,

I = V/Rt

I = 1/4 = 0.25 ampere for series arrangement.

I = 1/0.5 = 2 ohms.

Ratio of current of series to parallel = 0.25 : 2

= 1 : 8

4 0
3 years ago
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3 years ago
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iragen [17]
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It took a student 30 minutes to drive from his home to campus on
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Answer:

48 i believe

Explanation:

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