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3 years ago

Which factor does not usually increase the rate of reaction

1 answer:

6 0

There are many factors that increase the rate of reaction like concentration of reactants, atmosphere, presence or absence of catalyst, nature of reactants etc.
The factor usually does not increase the rate of reaction is lowering the temperature. But if we increase the temperature during reaction may be it increase the rate of reaction.

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How is the work done to hoist the counterweight related to the potential energy of the counterweight at its specified height?

Nesterboy [21]

Answer:

The work done to lift the counterweight equals the potential energy acquired

Explanation:

since this is vertically applied force on the counterweight, and the distance the force is displacing the counterweight is in the same direction as the applied force, it equals the gained potential energy

3 0

3 years ago

If R = 12 cm, M = 520 g, and m = 20 g (below), find the speed of the block after it has descended 50 cm starting from rest. Solv

timofeeve [1]

Answer:

v = 0.84 m/s

Explanation:

given,

R = 12 cm

M (mass of pulley )= 520 g

m (mass of block)= 20 g

s = 50 cm = 0.5 m

using conservation of energy

Potential energy = Kinetic energy

$m g h = \dfrac{1}{2}mv^2 + \dfrac{1}{2}I\omega^2$

$I_{disk}= \dfrac{1}{2}MR^2$ and v = r ω

$m g h = \dfrac{1}{2}mv^2 + \dfrac{1}{2}(\dfrac{1}{2}MR^2)(\dfrac{v}{R})^2$

$m g h = \dfrac{1}{2}mv^2 +\dfrac{1}{4}Mv^2$

$m g h = \dfrac{1}{2}v^2(m +\dfrac{1}{2}M)$

$v=\sqrt{\dfrac{2mgh}{m + 0.5 M}}$

$v=\sqrt{\dfrac{2\times 0.020 \times 9.8 \times 0.5}{0.02 + 0.5\times 0.52}}$

v = √0.7

v = 0.84 m/s

5 0

3 years ago

identify the action reaction forces in each picture the first picture is done for you write your answer on a separate sheet of p

xxMikexx [17]

Newton's Third Law of Motion states that for every action there must exist an equal but opposite reaction.

This ultimately implies that, Newton's Third Law of Motion is a law based on action-reaction force pairs.

In this exercise, you're required to identify the action-reaction forces in the attached picture.

Under condition A, a boy is leaning against a wall;

The force being exerted by the boy on the wall is a force of action.

The force being exerted by the wall on the boy is a force of reaction.

Under condition B, a boy is jumping off a diving board.

The force being exerted by the feet of the boy on the diving board is a force of action.

The force being exerted by the diving board on the feet of the boy is a force of reaction.

Under condition C, a nail is being hammered into the wall.

The force being exerted by the hammer on the nail is a force of action.

The force being exerted by the nail on the hammer is a force of reaction.

Under condition D, a man is walking on a ground (floor).

The force being exerted by the foot of the man on the ground (floor) is a force of action.

The force being exerted by the ground (floor) on the foot of the man is a force of reaction.

Under condition E, a boy is holding a ball;

The force being exerted by the hand of the boy on the ball is a force of action.

The force being exerted by the ball on the hand of the boy is a force of reaction.

4 0

3 years ago

A tall cylinder with a cross-sectional area 12.0 cm² is partially filled with mercury; the surface of the mercury is 5.00 cm abo

JulijaS [17]

Answer:

$V = 816 cm^3$

Explanation:

As we know that gauge pressure of the fluid at the bottom of the cylinder is given as

$P = \rho g h$

now we know that pressure at the bottom is double when water is poured on the mercury

So we have

$\rho_{hg} g h_1 = \rho_w g h_2$

so we will have

$13.6 \times 5 = 1 \times h$

so we have

$h = 68 cm$

now the volume of the water added to it is given as

$V = h A$

$V = (68 cm)(12 cm^2)$

$V = 816 cm^3$

6 0

4 years ago

Question 1 A ship's position is given as 0 degrees latitude and 27 degrees west longitude. We can conclude from this information

matrenka [14]

Answer: e. on the equator and in the Atlantic Ocean

Explanation:

Latitude and Longitude are geographical coordinates.

Latitude is the angular distance between the equatorial line, and a specific point on the Earth. It is measured in degrees and is represented according to the hemisphere in which the point is located, which can be north or south latitude.

In this sense latitude $0\°$ refers to the equatorial line that divides the Earth in two hemispheres (North and South).

On the other hand, Longitude represents the specific east–west position of a point on the Earth's surface, being longitude $0\°$ the prime meridian or Greenwich meridian.

So, if we have latitude $0\°$ and longitude $27\°$ (positive means it is to the East) we can already know the point is in the equator, and the option that bests describes the coordinates is e.

7 0

3 years ago