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3 years ago

A car travels 2155.0m in 195.9s. What is the car's average speed?

Physics

1 answer:

inna [77]3 years ago

3 0

Average speed of the car is 11 m/s

Explanation:

Speed is calculated by the rate of change of displacement.
It is given by the formula, Speed = Distance/Time
Here, distance = 2155 m and time = 195.9 s

Speed of the car = 2155/195.9 = 11 m/s

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Two soccer players kick the same 1-kg ball at the same time in opposite directions. one kicks with a force of 20 n; the other ki

kolezko [41]

We can solve the problem by using Newton's second law of motion:
$\sum F = ma$ (1)
where
the term on the left is the resultant of the forces acting on an object
m is the mass of the object
a is the acceleration of the object

The mass of the ball in this problem is m=1 kg. Two forces are applied, in opposite directions, of 20 N and 12 N, therefore the resultant of the forces is
$\sum F= 20 N-12 N=8 N$

Therefore, we can rearrange eq.(1) and use these data to find the acceleration of the ball:
$a= \frac{\sum F}{m}= \frac{8 N}{1 kg}=8 m/s^2$

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2 years ago

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Calculate the p.e. of a 5 kg mass when it is (i) 3 m, (ii) 6 m, above the ground. (g = 10 N/kg)

Mashcka [7]

Explanation:

P.E=MGH

(1) P.E=5×10(G)×3

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= 300 kg m^/s^

Hope it helps, just remember the formula u can solve any question regarding gravition of earth (P.E=Mgh)

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2 years ago

a car with a mass of 2,000 kilograms is moving around a circular curve at a uniform velocity of 25 meters per second. the curve

Ber [7]

Fc=mv^2/r so we get

2000kg*(25m/s)^2/(80m)= 15625N of force

hope this helps! Thank You!!

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2 years ago

If a person looking at a poster sees green instead of yellow and doesn't see red at all, this person most likely has color blind

katrin [286]

Red - sensitive so answer is c

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2 years ago

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sonic is sliding down a frictionless 15m tall hill. He starts at the top with a velocity of 10m/s. At the bottom of the hill he

podryga [215]

Answer:

The maximum speed of sonic at the bottom of the hill is equal to 19.85m/s and the spring constant of the spring is equal to (497.4xmass of sonic) N/m

Energy approach has been used to sole the problem.

The points of interest for the analysis of the problem are point 1 the top of the hill and point 2 the bottom of the hill just before hitting the spring

The maximum velocity of sonic is independent of the his mass or the geometry. It is only depends on the vertical distance involved

Explanation:

The step by step solution to the problem can be found in the attachment below. The principle of energy conservation has been applied to solve the problem. This means that if energy disappears in one form it will appear in another.

As in this problem, the potential and kinetic energy at the top of the hill were converted to only kinetic energy at the bottom of the hill. This kinetic energy too got converted into elastic potential energy .

x = compression of the spring = 0.89

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2 years ago