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patriot [66]
3 years ago
7

Car accelerates 86km/hr in 4.6s . What is the average acceleration in m/s^2

Physics
1 answer:
never [62]3 years ago
4 0

speed = 86km/hr

= 86000/3600

= 23.889m/s

time = 4.6s

acceleration = 23.889/4.6

a = 5.19m/s^2

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A battery is connected to a light bulb in a circuit. There is a current of 2 A in the light bulb.
Georgia [21]

Answer:

Resistance of the light bulb = 1.33 ohm (Approx.)

Explanation:

Given:

Current in electric bulb = 2 Amp

Voltage in battery = 1.5 Volt

Find:

Resistance of the light bulb

Computation:

Resistance = Voltage / Current

Resistance of the light bulb = Voltage in battery / Current in electric bulb

Resistance of the light bulb = 2 / 1.5

Resistance of the light bulb = 1.33 ohm (Approx.)

5 0
2 years ago
How would a scientist go about determining if an unknown substance is an element, compound, solution, or heterogeneous mixture?
stepan [7]
<span>each of more than one hundred substances that cannot be chemically inter converted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e., the number of protons in the nuclei of its atoms. thats part of one</span>
5 0
3 years ago
The temperature of ice will rise until melting state​ select true or false
VladimirAG [237]

Answer:

True

Explanation:

  • I have learned that in grade school
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3 0
3 years ago
If our Sun and solar system had formed at the same time as the very first stars in the universe, describe how and why our solar
aleksley [76]

Answer:

How: It will have a very different chemical composition.

Why: Because the interstellar medium at the beginning of universe were compounded only of Hydrogen and Helium.

Explanation:

Once the Big Bang passed and the universe began its expansion, the temperature started to decrease, what allowed the combination of hydrogen and helium. Therefore, the chemical composition of the molecular cloud in which the first stars were formed only held those elements.

If the Sun and the solar system were formed from a molecular cloud with that composition, it will both have an absence of metallic elements (elements heavier than helium), since all of them are formed through nuclear reactions in the core of the stars, and each time a star dies, the interstellar medium for the next generation is enriched.

Key elements for life as Carbon, Nitrogen, Oxygen, Phosphorus and Sulfur will be missing for that hypothetical scenario.

For example, the lack of O3 (ozone) in the atmosphere of earth will allow that ultraviolet light hits the earth surface.

8 0
3 years ago
An athlete with a mass of 65.5 kg is in a cross country race, and at one instant he has a speed of 4.20 m/s. (a) What is his kin
lions [1.4K]

Answer:

(A) Kinetic energy will be 577.7 j

(b) Factor by which kinetic energy will change is 4                      

Explanation:

We have given mass of the athlete m = 65.5 kg

He has a speed of 4.20 m/sec

So v = 4.20 m/sec

(a) Kinetic energy is given by KE_i=\frac{1}{2}mv^2=\frac{1}{2}\times 65.5\times 4.20^2=577.71J

(B) Now he wishes to doubles his speed So now speed = 4.20×2 = 8.40 m/sec

Now kinetic energy is KE_f=\frac{1}{2}mv^2=\frac{1}{2}\times 65.5\times 8.40^2=2310.84j

So the factor by which kinetic energy will change =\frac{KE_F}{KE_I}=\frac{2310.84}{577.7}=4

3 0
3 years ago
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