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4 years ago

Who created the light bulb?

1 answer:

5 0

There were 2 people
Tomas Edison
Joseph Swan

Tomas Edison invented the first practical incandescent lightbulb.

Sir Joseph Swan is most famous for his role in the development of the first incandescent lightbulb.

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The 1994 Winter Olympics included the aerials competition in skiing. In this event skiers speed down a ramp that slopes sharply

kykrilka [37]

Answer: Got It!

Explanation: let s = speed at launch

v = 0 at top = s sin 63 - g t

so at top

t = s sin 63/g = .0909 s

h = 13.6 = s sin 63 t - 4.9 t^2

13.6 = .081s^2 - .0405 s^2

s^2 = 336

s = 18.3 m/s

0 0

4 0

3 years ago

A spring requires 10 N of force to hold it 1 m past its natural length. How much work is required to stretch it from its natural

Ulleksa [173]

Answer:

5 J

Explanation:

F = spring force required to stretch the spring = 10 N

x = stretch in the spring = 1 m

k = spring constant of the spring

Spring force is given as

F = k x

Inserting the values

10 = k (1)

k = 10 N/m

W = work done in stretching the spring

Work done is given as

W = (0.5)k x²

Inserting the values

W = (0.5) (10) (1)²

W = 5 J

5 0

4 years ago

In a cold pack, an ___________ reaction draws heat from the surroundings. A. exothermic B. endothermic C. exergonic

elena-s [515]

In a cold pack, an endothermic reaction draws heat from the surroundings, although there are several different types of cold packs, some with different reactions.

8 0

4 years ago

Read 2 more answers

An engine has an energy input of 125 J, and 35 J of that energy is transformed into useful energy. What is the efficiency of the

xeze [42]

The efficiency of the engine at the given useful energy and input energy is 28%.

The given parameters:

Input energy of the engine, = 125 J
Useful energy of the engine, 35 J

The efficiency of the engine is defined as the ratio of the output energy (useful energy) to the input energy and it is calculated as follows;

$efficiency\ = \frac{0ut put \ energy}{1nput \ energy} \times \ 100\%\\\\efficiency\ = \frac{35}{125} \times 100\%\\\\efficiency\ = 28 \ \%$

Thus, the efficiency of the engine at the given useful energy and input energy is 28%.

Learn more about efficiency of engine here: brainly.com/question/6751595

7 0

2 years ago

If two variables have a non-related relationship and one of the variables is changed, how will the other variable change?

PolarNik [594]

If one of the variables is changed, that tells nothing about what happens to the other one, or IF anything happens, or when, or how long it lasts. Because they are UN-RELATED. You just said so yourself.

None of the choices says this.

6 0

3 years ago