If you apply 100.0 N of force to lift an object with a single, fixed pulley, then what is the resistive force?

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Answer 1

Answer: If you apply 100.0 N of force to lift an object with a single, fixed pulley, then the resistive force is also equivalent to 100 Newtons of force. Since the weight of the object was not mentioned, it is assumed that it has already been taken into account in the 100 N value of force. This follows Newton's law of motion of equal action and reaction.

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A man is carrying a trolley of mass 6kg and having K.E. of 40 J . Calculate its velocity with which he is running .

Answers

The formula to find kinetic energy is -

$K.E. = (1)/(2)*m* v^(2)$

Where,

$m = mass$

and

$v = velocity$

So, putting the values in the formula we get -

$40 = (1)/(2) *6*v^(2)$

$(40)/(3) = v^(2)$

$\sqrt (40)/(3) = 3.6514 m/s$

As we know that K.E = 1/2 mv² so
by arranging it
K.E ×2÷6 = v²
now by putting values
v²=13.33 m²/s²
so
v= 3.65 m/s....

Wave X has an amplitude of 5 and wave Y has an amplitude of 4. What will happen when the crest of wave X meets the crest of wave Y?A crest with an amplitude of 1 will form.
A trough with an amplitude of 1 will form.
A crest with an amplitude of 9 will form.
A trough with an amplitude of 9 will form.

Answers

Answer: A crest with an amplitude of 9 will form.

Explanation:

From super position principle, we know that when two waves move in same medium meet, then the net amplitude of the super imposed waves is sum of amplitudes of individual waves.

A constructive superposition takes place when crest meets crest and crest is formed of higher amplitude or trough meets trough and forms trough of higher amplitude. A destructive superposition takes place when crest of one meets trough of other -a crest or trough can form depending on the larger amplitude of either.

In the given situation, crest of wave X meets crest of wave Y. The amplitude of the super imposed wave would be = 5 + 4 = 9 and a crest would form.

The right answer for the question that is being asked and shown above is that: "A crest with an amplitude of 9 will form." Wave X has an amplitude of 5 and wave Y has an amplitude of 4. the crest of wave X meets the crest of wave Y is that A crest with an amplitude of 9 will form.

A photon with a frequency of 5.48 × 10^14 hertz is emitted when an electron in amercury atom falls to a lower energy level.

Calculate the energy of this photon in joules. [Show all work, including the equation and substitution with
units.]

Answers

The energy of the photon in joules, given that it's has a frequency of 5.48×10¹⁴ Hz is36.33×10¯²⁰ J

Data obtained from the question

Frequency (f) = 5.48×10¹⁴ Hz
Energy (E) =?

How to determine the energy

Planck's constant (h) = 6.63×10¯³⁴ Js
Frequency (f) = 5.48×10¹⁴ Hz
Energy (E) =?

The energy of the photon can be obtained as follow:

E = hf

E = 6.63×10¯³⁴ × 5.48×10¹⁴

E = 36.33×10¯²⁰ J

Learn more about energy:

brainly.com/question/10703928

#SPJ2

Using the Planck's Equation, comes:

$E=hf \n E=6.63*10^(-34)*5.48*10^(14)*J \n \boxed {E=36.3324*10^(-20)*J}$

If you notice any mistake in my english, please let me know, because i am not native.

A hard material is easily scratched. True False

Answers

False. Hard material an only be scratched by a material of equal or greater hardness

Why current remains same in series combination of resistors in all resistors and p.d. remains different?

Answers

Current at all points of a series circuit must be the same, because there's no place in the circuit where electrons are being manufactured, and no place where they're leaking out and falling on the floor. The nimber of electrons that leaves the loop is the same number that entered it. I'm not sure what is nmeant by "p.d. remains different" .

Einstein's famous equation indicates that E=mc^2, where c is the speed of light and m is the object's mass. Given this, what is the SI unit for E?