Why are both accuracy and reproducibility important in making a measurement?

Answers

Answer 1

Answer: accuracy is how close you're measurement comes to an accepted or given value. I n many cases you do not know what the accepted value is, so you have nothing to compare your measurement with. The more often a measurement is taken with close precision, or reproducibility, the more likely you are to being close to your unknown accepted value.
There is a great short tutorial video covering accuracy and precision at Sciocity dot com

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[URGENT] A swimmer wants to end up at a dock due north of her starting position on the south shore of a river. In still water her maximum speed is 1.25m/s. The river has a current flowing 0.35m/s [E].a.) calculate the direction that she must aim herself through the water to arrive at the dock. b.) how long will it take for the swimmer to cross the river, if the distance from the starting point to the dock is 300 m?Please show all your work, thanks
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Which statement best compares potential and kinetic energy?. . A) Objects always have more potential energy than kinetic energy.. B)Only kinetic energy increases when the velocity of an object increases. . C)Only potential energy decreases when an object’s height increases.. D)Objects always have more kinetic energy than potential energ

What causes light to bend when it moves from one transparent medium to another?a change in amplitude

a change in color

a change in frequency

a change in speed

Answers

Answer:

A change in speed

Explanation:

Light bends when it moves at a particular angle into a medium that has a different refractive index than the one it was coming from.

This bending is as a result of the change in speed of light as it enters the medium with a different refractive index.

This action is known as Refraction of light.

Refraction depends on the change in speed of light as it changes media and the angle of refraction depends on the angle of incidence of the ray of light and the refractive index of the material.

Whenever light goes from transparent to another medium or from rarer to denser medium or vice versa, it's speed changes and hence light bends.

You're driving down the highway late one night at 19 m/s when a deer steps onto the road 35 m in front of you. Your reaction time before stepping on the brakes is 0.50 s , and the maximum deceleration of your car is 10 m/s² . How much distance is between you and the deer when you come to a stop? What formulas do you use?

Answers

Answer:

x= x0 + v0t+ 1/2at^2

Explanation:

Which of the following does not represent a mechanical wave?sound
waves in the ocean
waves in a wheat field
light

Answers

The example that does not represent a mechanical wave is light. A mechanical wave requires a medium in order for it to travel and propagate. Examples of such is sound waves that travel through the air or ocean. Light is an electromagnetic wave because it makes use of particles called photons to propagate.

Which of the following does not represent a mechanical wave?

light

Can you think of a scenario when the kinetic and gravitational potential energy could both be zero ? Describe or draw how this could be possible below

Answers

Both kinetic and gravitational potential energy can become zero at infinite distance from the Earth.

Consider an object of mass m projected from the surface of the Earth with a velocity v.

The total energy of the body on the surface of the Earth is the sum of its kinetic energy $(1)/(2) mv^2$ and gravitational potential energy $-(GMm)/(R^2)$ .

here, M is the mass of the Earth, R is the radius of Earth and G is the universal gravitational constant.

The gravitational potential energy of the object is negative since it is in an attractive field, which is the gravitational field of the Earth.

The energy of the object on the surface of the earth is given by,

$E_i=(1)/(2) mv^2-(GMm)/(R^2)$

As the object rises upwards, it experiences deceleration due to the gravitational force of the Earth. Its velocity decreases and hence its kinetic energy decreases.

The decrease in kinetic energy is manifested as an equal increase in potential energy. The potential energy becomes less and less negative as more and more kinetic energy is converted into potential energy.

At a height h from the surface of the Earth, the energy of the object is given by,

$E_h=(1)/(2) mv_h^2-(GMm)/((R+h)^2)$

The velocity $v_h$ is less than v.

When h =∞, the gravitational potential energy increases from a negative value to zero.

If the velocity of projection is adjusted in such a manner that the velocity decreases to zero at infinite distance from the earth, the object's kinetic energy also becomes equal to zero.

Thus, it is possible for both kinetic and potential energies to be zero at infinite distance from the Earth. In this case, kinetic energy decreases from a positive value to zero and the gravitational potential energy increases from a negative value to zero.

What is 54 km = _____ cm
Im working on physical science and I need help ):

Answers

1 km = 100,000 cm
54 km = 54 x 100,000 cm = 5,400,000 km

It is 5400000 cm long

Which describes a grizzly bear’s habitat? all the biotic factors in the ecosystem all the abiotic factors in the ecosystem the role of the bear in the ecosystem the physical area where the bear lives

Answers

The best description of a grizzly bear’s habitat is:

D. the physical area where the bear lives

A habitat is the natural surrounding or place where an organism lives, grows and competes with other organisms for resources. It is a physical area.

There are three major types of habitat which includes:

Freshwater habitat: This refers to the area of water where animals live. Examples of animals that live in a freshwater habitat includes: sea turtle, fishes, etc. Examples of freshwater habitat include:

Rivers
Lakes
Pond, etc

Marine water habitat: This is where a group of organisms live. Examples include:

Oceans
Seas, etc.

Coastal habitat: This is an intersection between the land and sea habitats.

A grizzly bear is a subspecies of brown bear and is resident in the northern plains of America and their habitat is a physical location where they live.

Therefore, the correct answer is option D