According to newton's third law of motion, when a hammer strikes and exerts force to push it into a piece of wood, the nailA. creates a friction with the hammer
B. exerts an equal force on the wood
C. exerts an equal or opposite force on the hammer
D. moves at a constant speed

Answers

Answer 1

Answer: According to newton's third law of motion, when a hammer strikes and exerts force to push it into a piece of wood, the nail C. exerts an equal or opposite force on the hammer. The third law of motion states that every action has an equal BUT opposite reaction. This means that the nail exerts the same force the hammer exerts on it.

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Which statement is true about the loudness of sound?A. It is directly proportional to the distance of the listener from the source. B. It is inversely proportional to the square of the distance of the listener from the source. C. It is directly proportional to the square of the distance between the listener from the source. D. It is inversely proportional to the distance between the listener from the source.
Why does an insulator has a high resistance
The wavelengths for visible light rays correspond to which of these optionsA. About the size of a pen B. About the size of a virus or large molecule C. About the size of an amoeba D. Smaller than an atom E. About the size of a football field
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Amendments to the Constitution can be proposed bythe president and vice president.Congress and state legislatures.the president and the Supreme Court.Congress and the Supreme Court.

How do the units of work and power compare? a) The unit for work is a watt. The unit for power is a joule, which is a watt-second. b)The unit for work is a watt. The unit for power is a joule, which is a watt per second. c)The unit for work is a joule. The unit for power is a watt, which is a joule-second.
d)The unit for work is a joule. The unit for power is a watt, which is a joule per second.

Answers

Answer:

Option (d) is correct.

Explanation:

Work done is given by :

W = Fd, where F is force and d is displacement

Unit of work done :

The SI unit of force is Newton (N) and that of displacement is meter (m). So, the unit of work done is N-m. It is call Joule. It means that the unit of work done is Joule.

Power is given by rate at which the work is done. It is given by :

P = W/t, W is work done and t is time

Unit of power:

Unit of work is Joule (J) and that of time is second (s). It means that the unit of power is Watt and it is equal to Joule/second

Hence, the correct option is (d) "The unit for work is a joule. The unit for power is a watt, which is a joule per second".

Answer: The unit for work is a joule. The unit for power is a watt, which is a joule per second.

Explanation:

Soil can best be described as the A. layer of bedrock four layers beneath the Earth's surface.
B. sandy bottom of the ocean's floor.
C. third layer beneath the Earth's surface.
D. loose covering of weathered rocks and decaying organic matter.

Answers

The correct option is D. Soil can best be described as the loose covering of weathered rocks and decaying organic matter. There are different types of soil, the type of soil formed depends majorly on the type of parent rock from which the soil is formed and the amount of organic matter present in the soil.

The molecular formula for phosphorous pentoxide is p4o10. What is its empirical formula?

Answers

Answer: P2O5

Explanation:

Final answer:

The empirical formula for phosphorous pentoxide is P2O5.

Explanation:

The empirical formula for phosphorous pentoxide is P2O5.

To find the empirical formula, we need to determine the ratio of atoms in the compound.

Since the molecular formula of phosphorous pentoxide is P4O10, we divide the subscripts by their greatest common divisor (gcd) to get P2O5 as the empirical formula.

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A trombone has a variable length. When a musician blows into the mouthpiece and causes air in the tube of the horn to vibrate, the waves set up by the vibrations reflect back and forth in the horn to create standing waves. As the length of horn is made shorter, what happens to the frequency?A) The frequency will increase or decrease depending on how hard the horn player blows.
B) The frequency will increase
C) The frequency will decrease
D) The frequency will increase or decrease depending on the diameter of the horn.
E) The frequency will remain same

Answers

Answer:

B) The frequency will increase

Explanation:

The length of the instrument is given by

$L=(\lambda)/(2)\n\Rightarrow \lambda=2L$

Wavelength is given by

$\lambda=(v)/(f)$

$(v)/(f)=2L\ or\ L\propto (1)/(f)$

It can be seen that the length is inversely proportional to the frequency.

Here, the length of the trombone is decreasing so the frequency will increase.

You're conducting a physics experiment on another planet. You drop a rock from a height of 2.3 m and it hits the ground 1.1 seconds later. What is the acceleration due to gravity on this planet?A. 4.2 m/s2
B. 3.8 m/s2
C. 2.4 m/s2
D. 9.8 m/s2

Answers

Acceleration due to gravity on this planet will be 3.802 m / s^2

What are equations of motion?

Equation of motion are defined as equations that describe the behavior of a physical system in terms of its motion as a function of time

Using equation of motion

u=0

s= 2.3 m

t = 1.1 sec

to find = g (acceleration due to gravity on this planet)

s = u t + 1/2 (a ) (t ^(2))

s = 1/2 (g) (t^2)

2.3 = 1/2 (g) (1.1^2)

g = 2 * 2.3 /(1.1)^2

g = 4.6 /1.21= 3.802

correct answer is b) g = 3.802 m / s^2

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You get $2.3=1.21*\frac{a}2$ or $4.6=1.21a$ or $a=3.802$ (B)

A driver's car overheats. He hypothesizes that a broken fan belt has caused this problem. Which discovery is MOST likely to cause him to revise his hypothesis? a. reduction in outdoor temperature b. an intact fan belt c. a temperature warning light d. a crack in the radiator