If you see ##### in a cell, you should

Which of these is an example of chemical energy being converted to mechanical energy?

asambeis [7]

Answer:

Eating breakfast then walking to the bus

7 0

2 years ago

It's a snowy day and you're pulling a friend along a

NeX [460]

The coefficient of friction between the sled and the snow is 0.119.

To find the answer, we need to know about the friction.

<h3>How to find the coefficient of friction between the sled and the snow?</h3>

Whenever a body moves over the surface of another body, a force come into play, which acts parallel to the surface of contact and oppose the relative motion. This opposing force is called friction.
To solve the problem, we have to draw the free body diagram of the given system.
We have given with the following values,

$a=0\\\alpha =35^0\\T=75N\\m=57kg$

Here, acceleration will be equal to zero, because the velocity is given as constant.

Thus, from the diagram, we can write the balancing equations as follows,

$ma=Tcos\alpha -f\\\where\\f=kN\\\N+Tsin\alpha=mg\\Thus,\\N=mg-Tsin\alpha$

Substituting N in f and f in the equation of ma, then we get,

$ma= Tcos\alpha -k(mg-Tsin\alpha )$

Substituting values, we get the coefficient of friction as,

$0=(75*cos35)-k((57*9.8)-(75sin35))\\\\k((57*9.8)-(75sin35))=(75*cos35)\\\\515.6k=61.44\\\\k=\frac{61.44}{515.6}=0.119$

Thus, we can conclude that, the coefficient of friction between the sled and the snow is 0.119.

Learn more about the friction here:

brainly.com/question/28107059

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6 0

11 months ago

Read 2 more answers

Please help me i dont get it

Dima020 [189]

The answers are:

39:

a - 1 mile

b - 0 miles

40:

$a=-4\frac{m}{s^{2} }$

41:

$Displacement=3.60 miles\\Distance=5 miles$

Why?

Solving 39:

To answer the questions, we need to remember that distance and displacement are different things. Distance refers to the total "ground" covered during motion, while displacement refers to how far is the object/body from its starting point.

So,

39:

a - the total distance traveled corresponds to the length of the track which is 1 mile.

b - The displacement is equal to 0 because they finished at the starting point, the distance between the starting and the finishing point is equal to 0.

40:

We can solve the problem using one of the given equations:

$a=\frac{v_f-v_i}{t}$

Since we know all the information, we just need to substitute it into the equation:

$a=\frac{v_f-v_i}{t}\\\\a=\frac{2\frac{m}{s} -16\frac{m}{s} }{3.5s}=\frac{-14\frac{m}{s} }{3.5s}\\\\a=-4\frac{m}{s^{2} }$

So, the car's acceleration was -4m/s2 (the car was reducing its speed)

41:

We can solve the problem using one of the given equations (Pythagorean Theorem):

$c^{2}=a^{2}+b^{2}$

$Displacement=\sqrt{(3mi(North))^{2}+(2miles(East))^{2}}\\\\Displacement=\sqrt{9+4}=\sqrt{13mi^{2}}=3.60miles$

The distance will be:

$Distance=3mi+2mi=5miles$

Have a nice day!

3 0

2 years ago

A rod of length L and electrical resistance R moves through a constant uniform magnetic field B with rightwards harpoon with bar

NNADVOKAT [17]

Answer:

0 N

Explanation:

Magnetic force for charges moving in wire is given by

F = qvB sin θ

It can also be rewritten for a current carrying wire as

F = ILB sin θ

IL = product of the length of wire and magnitude of the current vector

B = magnetic field.

θ = the angle between the direction of current flow and the magnetic field. For this question, the direction for the two are both parallel; θ = 0°

F = IL B sin 0 = 0 N

Hope this Helps!!!

4 0

2 years ago

What are some examples of motion? Include the examples you found and describe an accurate frame of reference for one example. Th

Alex17521 [72]

Walking, running, and breathing are examples of motion. For rolling of ball, the street is a frame of reference and an insect on the ball is an inappropriate frame of reference.

A frame of reference, also known as a reference frame, is a perspective used in physics to assess whether an object is moving. A frame of reference is an environment or object that is thought to be stationary. The Earth itself, despite its motion, serves as the most frequently used frame of reference.

Some examples of motion are:

Motion is a part of many of our daily activities, including walking, running, closing doors, etc.

Another illustration of motion is the passage of air into and out of our lungs.

The vehicles that transport passengers between the point of pickup and the destination have motion.

A ball is rolling down the street that it is moving.

For a ball rolling down the street, the street is an appropriate frame of reference as it is rest as compared to the ball.

For the same example, the insect sitting on the rolling ball is a part of the rolling ball.

Therefore, the insect is an inappropriate frame of reference for the motion of the ball rolling down the street.

LEARN MORE ABOUT THE FRAME OF REFERENCE HERE:

brainly.com/question/13493096

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4 0

7 months ago