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kicyunya [14]
3 years ago
13

Which has more KE, a large truck moving at 50m/s or a bicycle moving at 10m/s?

Physics
2 answers:
klio [65]3 years ago
8 0
The truck has more KE than the bike
SOVA2 [1]3 years ago
4 0

truck by far ... do not get in its way ...

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A force on a toy airplane exerted a work of 100 J. What was the change in the kinetic energy?
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an object has a length of 5.0 cm, aheight of 3.0 cm and a width of 15.0 cm. it has a mass of 24 grams. what is its density?
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5x3=N
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Which is a negative effect of deforestation on the environment? A. habitat restoration B. desertification C. soil production D.
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Explanation:

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Three resistors of 15.0 ohms, 30.0 ohms, and 60.0 ohms respectively are connected in parallel to an applied potential difference
AVprozaik [17]
A).  The drawing looks like a ladder with 4 rungs.
One rung is a 90-volt battery.
The other 3 rungs are the 3 resistors.

b).  The equivalent resistance is the reciprocal of (1/15 + 1/30 + 1/60).
That's the reciprocal of  7/60, or about 8.571... ohms. 

c).  I = V/R = 90 / 8.571...  =  10.5 Amperes.

d).  The 60-ohm resistor is connected directly across the battery.

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4 0
3 years ago
A rope of negligible mass is wrapped around a 225-kg solid cylinder of radius 0.400 m. The cylinder is suspended several meters
vodomira [7]

Answer:

a)6.67 m/s2

b)16.7 rad/s2

c)increasing angular acceleration

Explanation:

a) It's because the system is not just mass of the man, it consists of the man holding a rope wrapped around a cylinder, not just a man free falling. So you would have to consider the rotating cylinder under the torque created by the man gravity force.

Let g = 10m/s2

T = mgd =75*10*0.4 = 300 N.m

The from the mass moments inertial of the solid cylinder:

I = \frac{Mr^2}{2} = \frac{225*0.4^2}{2} = 18 kgm^2

we can calculate the angular acceleration of the cylinder:

\alpha = \frac{T}{I} = \frac{300}{18} = 16.7 rad/s^2

then translate that to acceleration:

a = \alpha * r = 16.7*0.4 = 6.67 m/s^2

c) if the mass of the rope is not neglected, that means the force of gravity increases as the rope unwrapping around the cylinder, so the torque increases. Also the moment of inertial of the rope-cylinder system decreases due to rope unwrapping. In the end, the angular acceleration is no longer constant, but increasing.

4 0
3 years ago
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