3 years ago

How is a velocity of zero different from an acceleration of zero?

Physics

1 answer:

sergey [27]3 years ago

3 0

Velocity basically means how fast you are going. Acceleration means how much your speed is increasing.

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If the current in a wire of a cd player is 12.0 ma, how long would it take for 6.50 c of charge to pass a point in this wire? an

Galina-37 [17]

The current intensity is defined as the amount of charge Q that passes through a certain point of an electrical wire in a time interval of $\Delta t$ :
$I= \frac{Q}{\Delta t}$

In our problem, the current intensity is
$I=12.0 mA=0.012 A$
while the amount of charge that passes a certain point of the wire is
$Q=6.50 C$

If we re-arrange the previous equation:
$\Delta t= \frac{Q}{I}$
we can find the time needed for this amount of charge to pass through a point of the wire:
$\Delta t= \frac{6.50 C}{0.012 A} =541.7 s$

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3 years ago

A 13.6 kg block is tied at the top of an incline to a tree. If the incline is 35.5 degrees and the coefficient of friction betwe

Gre4nikov [31]

Answer:

Explanation:

ASSUMING that block = sled AND that the rope is parallel to the slope.

The force acting parallel due to the weight is

13.6(9.81)sin35.5 = 77.475 N

The maximum friction force is

(0.45)13.6(9.81)cos35.5 = 48.877 N

If rope tension is T

77.475 - 48.877 < T < 77.475 + 48.877

28.6 N < T < 126 N

28.6 N will occur if the block is on the verge of sliding downhill

126 N will occur if the block is on the verge of sliding uphill

Could be any value between them.

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3 years ago

At t = 0, a car registers at 30 miles/hr. Forty seconds later, the car’s velocity is now at 50 miles/hr. Assuming constant accel

ratelena [41]

D.

50 mph - 30 mph= 20 mph net velocity
change.
20mph/3600 seconds/hour= .00555 MPS
.0055 miles per second

40 seconds to complete the change
.0055/40= .000138

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3 years ago

What provides the force necessary to start a building or bridge oscillating?

Andrew [12]

Usually, the forces that start the oscillation of buildings are the wind and microearthquakes.

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3 years ago

Three charges are arranged as shown in the picture above. Find the magnitude and direction of the electrostatic force on the 6 n

bagirrra123 [75]

Answer:

Bot Nm

Explanation:

jdjdmxjd mdjdcj jdsdj jedidj jddj

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3 years ago