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3 years ago

13

You tie a cord to a pail of water, and you swing the pail in a vertical circle of radius 0.600 m. what minimum speed must you gi

ve the pail at the highest point of the circle if no water is to spill from it?

1 answer:

omeli [17]3 years ago

6 0

Hrre si yen nserrras

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Nerve cells transmit electrical signals through their long tubular axons. These signals propagate due to a sudden rush of Na+ io

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3 years ago

A new electric car makes use of storage batteries as it source of energy. Its mass is 1300kg and it is powered 26 batteries, eac

Lorico [155]

Answer:

a) Horse power required = 3.575 hp

b) The battery must be charged after approximately 225 km

Explanation:

a) Frictional force, F = 240 N

Average speed of the car = 40 km/h = 40 * (1000/3600) = 11.11 m/s

Horse power required = Power dissipated by the frictional force

Power = Force * Velocity

Power = 240 * 11.11

Power = 2666.67 Watt

746 Watt = 1 hp

2666.67 Watt = 2666.67/746

Horse power required = 3.575 hp

b)

The charge of 1 battery, Q = 52 Ah = 52 * 3600 = 187,200 C

Q = 187,200 C

For 24 batteries, Q = 24 * 187,200

Q = 4492800 C

Power consumed by the batteries, P = QV/t

P = 2666.67 W

2666.67 = (4492800 * 12)/t

t = (4492800 * 12)/2666.67

t = 20217.575 s

Velocity = distance/time

11.11 = distance/20217.575

distance = 20217.575 * 11.11

distance = 224617.26 m

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3 years ago

You are loading a refrigerator weighing 2267 N onto a truck, using a wheeled cart. The refrigerator is raised 1.09 m to the truc

meriva

Answer:

a).

Wmin= 2471.03 J

W=1603.01 J

Explanation:

Weight, w= 2267 N

$w= m*g\\W=m*g*h \\W=w*h$

Minimum work 'h' is the distance the refrigerator is raised h=1.09m

$W_{min}=2267 N* 1.09m\\W_{min}=2471.03 J$

The motion is no frictional force so, the magnitude of the force with a angle of 45.0° is find using:

$W=m*g*h'\\h'= sin(45)\\W=2267N*sin(45)\\W=1603.01 J$

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3 years ago