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3 years ago

Hurry!!!!!!!! Will give Brainliest!!!

Physics

2 answers:

Solnce55 [7]3 years ago

5 0

Theories, brainliest pls???

Alina [70]3 years ago

4 0

Bottom two are assumptions so it goes to then between razor and postulates but also postulate means theory. I don’t know what there definition used for razor is but that would have to be your best option 1-1=0

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Which statement describes the relationship between voltage and current

DaniilM [7]

Answer:

Ohm's Law. The relationship between voltage, current, and resistance is described by Ohm's law. This equation, i = v/r, tells us that the current, i, flowing through a circuit is directly proportional to the voltage, v, and inversely proportional to the resistance, r.

Explanation:

6 0

4 years ago

If the initial velocity of an object was -2 meters per second

Shalnov [3]

A :-) for this question , we should apply
a = v - u by t
Given - u = -2 m/s
v = -10 m/s
t = 16 sec
Solution -
a = v - u by t
a = -10 - -2 by 16
a = -12 by 16
( cut 12 and 16 because 2 x 6 = 12 and
2 x 8 = 16 )
( cut 6 and 8 because 2 x 3 = 6 and
2 x 4 = 8 )
a = 3 by 4
a = 0.75 m/s^2

.:. The acceleration is 0.75 m/s^2.

3 0

3 years ago

In serving, a tennis player accelerates a 59 g tennis ball horizontally from rest to a speed of 34 m/s Assuming that the acceler

Akimi4 [234]

Answer:

The magnitude of the force exerted on the ball by the racquet is 94.73 N.

Explanation:

The force exerted on the ball is the following:

$F = ma$

Where:

m: is the mass of the ball = 59 g

a: is the acceleration

The acceleration of the ball can be found with the following kinematic equation:

$v_{f}^{2} = v_{0}^{2} + 2ad$

Where:

d: is the distance = 0.36 m

$v_{f}$ : is the final speed = 34 m/s

$v_{0}$ : is the initial speed = 0 (it start from rest)

Hence, the acceleration is:

$a = \frac{v_{f}^{2}}{2d} = \frac{(34 m/s)^{2}}{2*0.36 m} = 1605.6 m/s^{2$

Finally, the force is:

$F = ma = 59 \cdot 10^{-3} kg*1605.6 m/s^{2} = 94.73 N$

Therefore, the magnitude of the force exerted on the ball by the racquet is 94.73 N.

I hope it helps you!

6 0

3 years ago

Which value is equivalent to 178 centimeters?

seraphim [82]

Answer:

jsuddjjddj

Explanation:

nzjdnzjdndk

3 0

3 years ago

Read 2 more answers

4. A car of mass 2000 kg is traveling at 45 m/s when the driver spots a policeman anead. i ne univer apprivo

MariettaO [177]

Answer:

The change in the Kinetic Energy of the car, E = 1449000 joules

Explanation:

Given,

The mass of the car, m = 2000 Kg

The speed of the car, v = 45 m/s

The brake applied on the car for a duration, t = 3 s

The average force applied by the brake, F = 1.4 x 10⁴ N

The kinetic energy of the body is given by the relation,

K.E = 1/2 mv²

The initial kinetic energy of the car,

K.E = 0.5 x 2000 x 45

= 2025000 J

The force applied by the brakes

F = m x a

Therefore, the deceleration of the car

a = F / m

= 1.4 x 10⁴ / 2000

= 7 m/s²

Using the first equations of motion,

v = u + at

v = 45 + (-7) (3) ∵ (-7 ) car is decelerating

v =24 m/s

The final kinetic energy of the car

k.e = 0.5 x 2000 x 24

= 576000 J

The difference in the kinetic energy,

E = K.E - k.e

= 2025000 J - 576000 J

= 1449000 joules

Hence, the change in the Kinetic Energy of the car, E = 1449000 joules

3 0

3 years ago