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3 years ago

A tennis balls in the air and the potential energy increases. At the same time, it’s kinetic energy_because the velocity__

Physics

1 answer:

KengaRu [80]3 years ago

8 0

Answer:

Explanation:

More potential energy equals more kinetic

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Tanzania [10]

Answer:

Option c <em> </em>

Explanation:

soda fire extinguisher acts by cutting off supply of air and oxygen

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3 years ago

A driver in a 2000 kg Porsche wishes to pass to pass a slow-moving school bus on a four-lane road. What is the average power in

creativ13 [48]

Answer:

The power require to accelerate the car is, P = 299700 watts

Explanation:

Give data,

The mass of the car, m = 2000 kg

The initial velocity of the sports car, u = 30 m/s

The final velocity of the sports car, v = 60 m/s

The time period of acceleration, t = 9 s

The acceleration of the car, a = (v-u) / t

= (60 - 30) / 9

= 3.33 m/s²

The displacement of the car,

S = ut + ½ at²

= 30 x 9 + ½ x 3.33 x 9²

= 405 m

The force acting on the car, F = m x a

= 2000 x 3.33

= 6660 N

The work done by the car, W = F S

= 6660 x 405

= 2697300 J

The power of the car, P = W / t

= 2697300 / 9

= 299700 watts

Hence, the power require to accelerate the car is, P = 299700 watts

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4 years ago

4. We have 4 identical strain gauges of the same initial resistance (R) and the same gauge factor (GF). They will be used as R1,

Luba_88 [7]

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3 0

4 years ago

A dog in an open field runs 11.0 m east and then 28.0 m in a direction 49.0 ∘ west of north. In what direction must the dog then

Ede4ka [16]

Answer:

$\theta=19.03 SE$

Explanation:

From the question we are told that:

$d_1=11.0m East$

$d_2=28.0m 49 \textdegree west\ north$

$d_3=10m south$

Generally the equation for Resolutions is mathematically given by

$d_x=-11-(-28sin49)$

$d_x=10.132m$

Where

$d_y=-11-(28cos49)$

$d_y=-29.37m$

Generally the equation for Direction is mathematically given by

$\theta=tan^{-1}(\frac{dx}{dy})$

$\theta=tan^{-1}(\frac{10.132}{29.37})$

$\theta=19.03 SE$

7 0

3 years ago

Bob is pulling a 30kg filing cabinet with a force of 200N , but the filing cabinet refuses to move. The coefficient of static fr

vredina [299]

Answer:

$2.0\cdot 10^2 N$

Explanation:

The cabinet does not move: this means that the net force acting on it is zero.

Along the horizontal direction, we have two forces:

- The push exerted by Bob, F = 200 N, forward

- The frictional force, $F_f$ , which acts in the opposite direction (backward)

Since the net force must be zero, we have:

$F-F_f = 0$

So solving the equation we can find the magnitude of the friction force:

$F_f = F = 200 N=2.0 \cdot 10^2 N$

7 0

4 years ago

A tennis balls in the air and the potential energy increases. At the same time, it’s kinetic energy___because the velocity____

A tennis balls in the air and the potential energy increases. At the same time, it’s kinetic energy_because the velocity__