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2 years ago

Which statement is an observation from newton experiment with light

Physics

1 answer:

xeze [42]2 years ago

7 0

Answer:

White light is composed by a range of colors, this was discovered by Isaac Newton when he observed that a beam of white light was refracted (the different rays of light are diverted depending on their wavelengths) when passing through a prism . This phenomenon was later called dispersion

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Find the recoil velocity of a 65kg ice hockey goalie who catches a 0.15kg hockey puck slapped at him at a velocity of 50m/s. Ass

dimulka [17.4K]

Answer:

a. −0.12m/s

Explanation:

Given;

mass of the hockey goalie, m₁ = 65 kg

mass of the hockey puck, m₂ = 0.15 kg

velocity of the hockey puck, u₂ = 50 m/s

initial velocity of the hockey goalie, u₁ = 0

let the recoil velocity of the goalie = v

Apply Newton's third law of motion;

action and reaction are equal and opposite.

m₁v = -m₂u₂

65v = -(0.15 x 50)

65v = -7.5

v = - 7.5 / 65

v = -0.12 m/s

This shows that the goalie will move backwards with a velocity of 0.12 m/s.

7 0

2 years ago

A crate having mass 50.0 kg falls horizontally off the back of the flatbed truck, which is traveling at 100 km/h. Find the value

Volgvan

Answer:

$\mu = 0.786$

Explanation:

As we know that initial speed of the crate is

$v_i = 100 km/h$

$v_i = 27.78 m/s$

now finally the crate will come to rest

so we have

$v_f = 0$

now the deceleration due to frictional force is given as

$a = -\mu g$

distance moved by the crate before it will stop is given as

$d = 50 m$

so we will have

$0 - 27.78^2 = 2(-\mu(9.81))50$

$\mu = 0.786$

8 0

3 years ago

In 1949, an automobile manufacturing company introduced a sports car (the "Model A") which could accelerate from 0 to speed v in

Fudgin [204]

Answer: $\frac{P_B}{P_A}$ = 8.5264

Explanation: Power is the rate of energy transferred per unit of time: P = $\frac{E}{t}$

The energy from the engine is converted into kinetic energy, which is calculated as: $KE = \frac{1}{2}.m.v^{2}$

To compare the power of the two cars, first find the Kinetic Energy each one has:

K.E. for Model A

$KE_A = \frac{1}{2}.m.v^{2}$

K.E. for model B

$KE_B = \frac{1}{2}.m.(2.92v)^{2}$

$KE_B = \frac{1}{2}.m.8.5264v^{2}$

Now, determine Power for each model:

Power for model A

$P_{A}$ = $\frac{m.v^{2} }{2.t}$

Power for model B

$P_B = \frac{m.8.5264.v^{2} }{2.t}$

Comparing power of model B to power of model A:

$\frac{P_B}{P_A} = \frac{m.8.5264.v^{2} }{2.t}.\frac{2.t}{m.v^{2} }$

$\frac{P_B}{P_A} =$ 8.5264

Comparing power for each model, power for model B is 8.5264 better than model A.

7 0

2 years ago

What is the amount of heat, in calories, given off from a 5 g piece of aluminum when it cools from 80°C to 20°C? The specific he

vagabundo [1.1K]

Answer:

Q (heat) = S * m * (T2 - T1) where Q is heat gained (loss), S the specific heat capacity of the substance and T2, T1 are the final and initial temps

Q = .215 cal / (g deg C) * 5 g * (20 - 80) deg C = -64.5 cal

Since the question specifies the heat emitted, then 64.5 cal is the

heat emitted (loss).

8 0

2 years ago

If a school bus moves with the speed of 72km/hr, how many meters does it cover in one hour?

ELEN [110]

Explanation:

It is said that the bus moves with the speed of 72 km/hr.

It means that the bus covers 72 km in 1 hour.

so,

It covers 72 * 1000 m = 72000 m in one hour.

Hope it helps :)

3 0

2 years ago

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