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3 years ago

What is missing from this free body diagram of a sled being pulled across level ice by a dog team

Physics

2 answers:

erma4kov [3.2K]3 years ago

6 0

Answer:

The normal force

Explanation:

There are four forces acgint on the sled:

- the driving force, exerted by the dogs which pull the sled forward

- the frictional force, that act in the opposite direction of the driving force (backward)

- the weight of the sled, which is directed downward

- the normal force, which is the reaction of the surface on which the sled slides, and which pulls opposite to the weight (upward)

From the graph, we see that the only missing force is the one which is directed upward, so it must be the normal force.

yan [13]3 years ago

5 0

The best and most correct answer among the choices provided by the question is the first choice.

A normal force must be exerted upward to the body from the ground to achieve equilibrium. The arrow would be upward, ant it could be labeled as FN.
I hope my answer has come to your help. God bless and have a nice day ahead!

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Hey guys how to prevent from shock

Pie

U need an insulator to prevent the shock passing through , that's why there is a plastic sheet covering the copper wires so that it can prevent the electricity passing through as plastic is an insulator and does not conduct electricity

8 0

4 years ago

. You have completed your design of a new surgical headlamp. You have decided to power the headlamp using four AA rechargeable b

SSSSS [86.1K]

Answer:

LED run before the batteries are depleted is 3.87 hours

Explanation:

given data

battery = 4 AA

battery is rated = 1.2V, 2550 mAh

power = 3 W

efficient = 95%

to find out

How long will the LED run before the batteries are depleted

solution

we consider here power delivered by battery is = x

so power = x × efficient

3 = x 95%

x = 3.15 W

and

voltage by 4 battery is = 4 × 1.2 = 4.8 V

so current will be = $\frac{x}{volatge}$

current = $\frac{3.15}{4.8}$

current = 0.6577 A

so total discharge hours = $\frac{2550}{current}$

total discharge hours = $\frac{2550}{657.7}$

time = 3.87 hours

so LED run before the batteries are depleted is 3.87 hours

5 0

3 years ago

A 50 kg skater pushes off from a wall with a force of 200 N. What is the skater's acceleration?

lutik1710 [3]

Answer:

Explanation:

mass (m) = 50 kg

Force (F) = 200 N

Acceleration (a)= ?

WE know

F = m * a

200 = 50 * a

a = 200 / 50

a = 4 m/s²

Hope it will help :)

3 0

3 years ago

Electromagnetic energy travels inselect one:<br> a. long stringsb. short stringsc. burstsd. waves

aleksandrvk [35]

I think it's waves.
electromagnetic waves

6 0

4 years ago

Read 2 more answers

A gamma knife is most likely to produce electromagnetic waves at which of

beks73 [17]

Answer:

The correct option is C

C) 1020 waves per second

Explanation:

The frequencies and waveslengths of all the electromagnetic waves can easily be found by looking at the diagram of the selectromagnetic spectrum. If we notice the electromagnetic spectrum, we come to know that gamma rays have the highest frequency, about 10²⁰ Hz and the shortest wavelengths.

Therefore, a gamma knife will produces rays of about 10²⁰ waves per seconds

8 0

3 years ago