Question 1.1. Using correct biomechanics helps maximize sport performance. True
False

Question 2.2. The "Fosbury Flop" is named because his idea didn't work.
True
False

Question 3.3. Using correct biomechanics will actually decrease your chances of injury.
True
False

Answers

Answer 1

Answer: Question 1.1.True Question 2.2.False
Question 3.3.True
Hope this helps you!!! =')

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How many potassium atoms are in 2 K2CO3?

What type of machine is a pair of scissors?a. Simple - Lever
b. Simple - Wedge
c. Compound - Lever and Wedge
d. Compound - Inclined plane and lever.

Answers

The type of machine of a pair of scissors is a compound machine classified as lever and wedge. The answer is letter C. The pivot joint is the lever and the wedge are the blades of the scissors. This is to efficiently exert force on an object to cut it.

Does gas have as definite or indefinite volume

Answers

gases have an indefinite volume .

A block slides down a rough ramp with a 30-degree incline as shown.

Answers

Final answer:

The question involves a block sliding down a 30-degree incline, where the forces of gravity, normal force, and friction are in effect. The acceleration of the block can be determined by taking into account all the forces acting on it. This is a topic in Physics, typically studied at the high school level.

Explanation:

In the described scenario, a block is sliding down a rough ramp inclined at 30 degrees. This topic falls under the area of Physics, specifically in the study of friction and forces. The forces at play in this situation are gravity, normal force, and frictional force. When a block slides down an inclined plane, the force of gravity is divided into two components. The component parallel to the ramp, mg sin θ, acts downwards and is opposed by the force of friction.

The frictional force is determined by multiplying the normal force by the coefficient of friction (μ). This could be represented as F = μN, where F is the frictional slide and N is the normal force. The block's acceleration depends on the net force acting on it, considering all the forces at play.

In this particular situation, where there's a known coefficient of friction of 0.20 and given gravitational and normal forces are 40 N, you can use these values, along with the angle of the ramp, to find the acceleration of the block using formulae from physics.

Learn more about the Physics of sliding on an inclined plane here:

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Final answer:

A block sliding down a rough incline experiences forces from gravity, friction, and normal force. Friction opposes the motion, reducing the acceleration the block would have on a frictionless slope. The acceleration can be calculated from the incline angle and friction coefficient.

Explanation:

The question deals with the physics of a block sliding down a rough, incline plane. When a block is sliding down an inclined plane, there are several forces at play. The gravitational force pulls the block downwards, the normal force counters this directly perpendicular to the slope, and friction acts to oppose the motion of the block. The coefficient of friction between the block and the incline plays a crucial role in the block's acceleration down the incline.

The acceleration of the block can be calculated using the formula a = g sin θ, where g is acceleration due to gravity and θ is the incline angle. However, this applies when there's negligible friction. If friction is involved, it reduces the acceleration from this value. The acceleration on an incline where there is friction can be calculated with the equation ax = g sin θ - μk g cos θ, where μk is the coefficient of kinetic friction.

Using the equation above, you can calculate acceleration if you are given the friction coefficient and the incline's angle. However, if you're given the acceleration and either the incline angle or friction coefficient, you can rearrange the equation to calculate the missing variable, helping you gain more understanding about the impacts of the slope and friction.

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When a piece of aluminium foil is taken out of the oven and cools from 100C to 50C. What is the change in temperature?

Answers

When a piece of aluminum foil is taken out of the oven and cools from 100C to 50C. Then the change in temperature is 50°C.

What is temperature?

Temperature is a fundamental concept in physics that describes the degree of hotness or coldness of an object or system. It is a measure of the average kinetic energy of the molecules or particles that make up the object or system.

In other words, the temperature is a measure of how fast or slow the particles are moving. When the particles move faster, the temperature is higher, and when they move slower, the temperature is lower. Temperature is commonly measured using a thermometer, which is a device that detects changes in a physical property of a material, such as its volume, pressure, or electrical resistance, that vary with temperature.

The unit of measurement for temperature is the Kelvin (K) scale, although Celsius (°C) and Fahrenheit (°F) scales are also commonly used. The Kelvin scale is an absolute temperature scale, where 0 K represents the lowest possible temperature, known as absolute zero. The Celsius and Fahrenheit scales are relative scales that are defined by the freezing and boiling points of water at standard atmospheric pressure.

Here in the Question,

The change in temperature is 30 because the change in temperature is calculated by subtracting the initial temperature from the final temperature. In this case, the initial temperature is 100°C and the final temperature is 50°C. So the change in temperature is:

Change in temperature = final temperature - initial temperature

Change in temperature = 50°C - 100°C

Change in temperature = -50°C

The negative sign indicates a decrease in temperature, which is expected as the aluminum foil cools down from the higher initial temperature to the lower final temperature.

Therefore, it is common practice to report the absolute value of the change in temperature, which in this case is 50°C.

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Answer:

50°C

Explanation:

The change in temperature is basically the difference between the initial temperature to the final temperature. So change in temperature will be:

100°C - 50°C = 50°C

Which of the following statements about iron filings placed upon glass resting on top of a bar magnet is false? A. The density of the filings will match the intensity of the magnetic field. ield outlined by the filings will be from the north pole of the magnet to the south pole. C. The filings will be clustered more densely where the field is weakest. D. The filings will sit on the glass on curved paths between the north and south poles.

Answers

The correct answer for the question that is being presented above is this one: " C. The filings will be clustered more densely where the field is weakest." The statement about iron filings placed upon glass resting on top of a bar magnet that is false is that the filings will be clustered more densely where the field is weakest.

Correct answer choice is:

C. The filings will be clustered more densely where the field is weakest.

Explanation:

The closer mutually the field lines will be the more powerful the field would be present. The field is really powerful in the axis of the magnet, though as they are frequently accommodated in the magnet itself, the field is quite weak in the air close to the axis. As the field lines make rings, they have to penetrate in one spot and drop at different, the two poles must be extremely close mutually indeed in the air, and the field is consequently stronger. These points are the North and the south poles.

A 2.00 × 103 kg car rounds a circular turn of radius 20.0 m. If the road is flat and the coefficient of static friction between the tires and the road is 0.70, how fast can the car go without skidding?

Answers

Answer:

11.7 m/s

Explanation:

In order for the car to remain in circular motion along the road and not to skid, the frictional force between the tires and the road must be equal to the centripetal force.

Therefore, we can write:

$\mu mg = m(v^2)/(r)$