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2 years ago

What is the difference between constant and variable force ?

Physics

1 answer:

Nana76 [90]2 years ago

6 0

Constant force - stays the same throughout

Variable force - changes throughout

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Calculate the acceleration of a skier heading down a 10.0º slope, assuming the coefficient of friction for waxed wood on wet sno

lutik1710 [3]

(a) 0.74 m/s^2

Explanation:

There are two forces acting on the skier: the component of the weight parallel to the slope, which acts downward, and the frictional force, which acts upward along the incline.

The component of the weight parallel to the inclined plane is:

$W= m g sin \theta$

where m is the mass of the skier, $g=9.81 m/s^2$ and $\theta=10^{\circ}$ .

The frictional force is instead

$F_f = -\mu m g cos \theta$

$\mu=0.1$ is the coefficient of friction for waxed wood on wet snow.

If we apply Newton's second law, we can write that the net force must be equal to the product of mass per acceleration:

$mgsin \theta -\mu mg cos \theta =ma$

And symplifying m, we can find the acceleration:

$a=g sin \theta-\mu g cos \theta=$

$=(9.81 m/s^2)(sin 10^{\circ})-(0.1)(9.81 m/s^2)(cos 10^{\circ})=0.74 m/s^2$

(b) $5.7^{\circ}$

Explanation:

This time, the skier is moving at constant velocity. Therefore, the acceleration is zero (a=0) and Newton's second law becomes:

$mg sin \theta - \mu m g cos \theta=0$

By simplifying, we get

$tan \theta = \mu$

From which we can find the angle at which the skier could coast at a constant velocity:

$\theta= tan^{-1} (\mu) = tan^{-1} (0.1)=5.7^{\circ}$

6 0

2 years ago

For the following, determine the final volume in ml (V2) of a gas when it is heated to 373K (T2) when it's starting temperature

Ksju [112]

Answer:

136.63 ml

Explanation:

3 0

1 year ago

Carbon-14 is a naturally-occuring, stable isotope that is commonly used is scientific studies as a tracer and to date artifacts.

lina2011 [118]

The answer is that there are 6 electrons, 8 neutrons, and 6 protons in carbon 14. The answer is then, B.

3 0

2 years ago

Read 2 more answers

Which method is not a technique currently used by ocean scientists to map the topography of the ocean floor?

raketka [301]

Answer:

Magnetometer

Explanation:

Magnetometer technique is not using by scientists for studying the ocean floor.The scientists currently is using SONAR ( sound navigation and ragging) technique for studying the ocean floor.SONAR is used sound waves sound waves for studying the ocean floor or we can say that SONAR is based on sound propagation.

Therefore answer is Magnetometer

4 0

2 years ago

What is one advantage of doing a field experiment instead of a laboratory experiment

Flauer [41]

It mimics the real world accurately

Explanation:

Experiments conducted in the field clearly presents the real world at it is to the scientist. Hardly can any part be controlled precisely and this gives a near to perfect scenario.

In the laboratory, for example, an organism is isolated from its environment and might not fully display its natural instinct and physiological capabilities.
Most laboratory set up are driven towards a model instead of real life settings.
The laboratory is more controlled and less varied and might truly represent the real world. It will only portray a part of the real world and series of further tests might have to be carried out to have a better model.

Learn more:

Experiment brainly.com/question/5096428

#learnwithBrainly

5 0

2 years ago