What is the angle of refraction when a ray of light passes frm ethanol to air

A dockworker loading crates on a ship finds that a 20 kg crate, initially at rest on a horizontal surface, requires a 70 N horiz

frez [133]

The coefficient of static friction is 0.357 and the coefficient of kinetic friction is 0.265.

Explanation:

Coefficient of static friction is defined as the proportionality constant for the frictional force between the crate and floor for starting the motion of crate and normal force acting on the crate. As the normal force of the crate is equal to the influence of acceleration due to gravity acting on the mass of the crate, the frictional force for static friction coefficient will be the force applied to move the crate.

Thus, $Static friction force = Coefficient of static friction * Normal force\\\\$

Since, the static friction force is 70 N, the normal force is equal to $Mass * acceleration due to gravity = 20 * 9.8 = 196 N$

So normal force is 196 N and static force is 70 N, and the ratio of static friction force to the normal force will give the coefficient of static friction.

$Coefficient of static friction = \frac{Static friction force}{Normal force}\\ \\Coefficient of static friction = \frac{70}{196} = 0.357$

Similarly, the coefficient of kinetic friction can be determined from the ratio of kinetic friction force to normal force. Here the kinetic friction force will be equal to the force applied on the crate to keep it moving.

$Coefficient of kinetic friction = \frac{Kinetic friction force}{Normal force}\\ \\Coefficient of kinetic friction = \frac{52}{196} = 0.265$

Thus, the coefficient of static friction is 0.357 and the coefficient of kinetic friction is 0.265.

6 0

3 years ago

Lemonade powder is stirred into water until it dissolves. Which are true statements?

ASHA 777 [7]

Also B. Water is the solvent is correct

6 0

3 years ago

If you had 8 balls and 7 of them were a certain weight, and 1 of them was heavier, how could you find the heaviest ball. All the

dybincka [34]

Answer:

There are two method of comparing the balls 1) using a balance 2) by only 2 weighings.

Explanation:

There are two method of comparing the balls 1) using a balance 2) by only 2 weighings.

Make the following groups - --- (1,2,3),(4,5,6),(7,8)

Step 1. compare the Weigh (1,2,3) and (4,5,6)

there are 2 possible outcomes:

1---both the group are of same weight. and named as (Case A)

2--- one of the group is heavier than other and named as (Case B)

Step 2. Let examine both case

In Case A --in this case, now compare the weight of 7th and 8th ball. By this you have recognize the heavier ball by 2 weighing method.

In Case B -- considered the heaviest group (assume group (1,2,3) is heavy), from this group take randomly two ball and compare the their weight. out of these two ball, one is heavy else the third ball is.

7 0

3 years ago

What is the role of the midbrain, and which part of the midbrain is important for arousing the forebrain?

Rainbow [258]

Answer:

The fore-brain consists of the cerebrum, thalamus, and hypothalamus. Mid-brain relays information between fore-brain and hind-brain. Mid-brain plays important role in developing motor functions like eye movement, auditory functions and visual processing. The crus cerebri connects the cerebral hemispheres to the cerebellum, contains a portion having a network of neurons that is responsible for arousal and alertness.

6 0

3 years ago

Which one of these is not a rock? A. granite B. Shale C. marble D. Diamond

saul85 [17]

DIAMONDS are NOT rocks. Diamonds are minerals, rocks are made up of many different fragments of minerals.

3 0

4 years ago