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Anni [7]
3 years ago
5

What is the average speed, over the first 4.0 s of its motion, of a pebble released from rest off a bridge?

Physics
1 answer:
frez [133]3 years ago
7 0

Find the speed of the pebble after every second starting with t=0.

For this we can uses the newtons equation, v = u + a*t

where v is the final velocity, u is the initial velocity,  a is the acceleration which is 9.8 m/s²

When t = 0, Vf = 0 m/s

When t = 1, Vf = 9.8 m/s

Using v = 0 + 9.8*1

When t = 2, Vf = 19.6 m/s

Using v = 0 + 9.8*2

When t = 3, Vf = 29.4 m/s

Using v = 0 + 9.8*3

When t = 4, Vf = 39.2 m/s



Using v = 0 + 9.8*4

Then, you should just be able to average out the velocities and divide by five to get an average speed of 19.6 m/s! 


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3 years ago
A strand of 10 lights is plugged into a outlet. How can you determine if the lights are connected in series or parrel
NeTakaya

Answer:

C) Unscrew one light. If the other lights turn off, it's a series circuit.

Explanation:

THIS IS THE COMPLETE QUESTION BELOW;

A strand of 10 lights is plugged into an outlet. How can you determine if the lights are connected in series or parallel? A) Unscrew one light. If the other lights stay on, it's a series circuit. B) Unplug the strand. If the first light stays on, it's a series circuit. C) Unscrew one light. If the other lights turn off, it's a series circuit. D) Cut the strand in half. If the plugged in half stays on, it's a series circuit.

SERIES CIRCUIT

In this circuit, the components there are in the same path, the entire circuit has the same current, each of the components posses different voltage drop. Hence, failure of one components to work, there will be break in entire circuit then other components cease to work.

PARALLEL CIRCUIT

This circuit has equal voltage drop across all the components, any problem in a component will not has effect on other components.

Therefore, if one want to determine if a light connection is in series or in parallel, one of the light can be unplugged if others stop working it means it's series, if other works it's parallel.

5 0
3 years ago
3. How do you represent the strength of a<br> force in a free-body diagram?
ivann1987 [24]
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3 0
3 years ago
A toaster changes electrical energy to thermal energy. This is a/an
erastova [34]

A because the toaster converts electrical energy into heat energy and, after the bread has been heated for sufficient time, toasts pop out, ready to be buttered. And converting means transforming.

7 0
3 years ago
A satellite m-500 kg orbits the earth at a distance d 215 km, above the surface of the planet. The radius of the earth is re 6.3
AnnZ [28]

Answer:

7.78 * 10³ m/s

Explanation:

Orbital velocity is given as:

v = √(GM/R)

G = 6.67 * 10^(-11) Nm/kg²

M = 5.98 * 10^(24) kg

R = radius of earth + distance of the satellite from the surface of the earth

R = 2.15 * 10^(5) + 6.38 * 10^(6)

R = 6.595 * 10^(6) m

v = √([6.67 * 10^(-11) * 5.98 * 10^(24)] / 6.595 * 10^(6))

v = √(6.048 * 10^7)

v = 7.78 * 10³ m/s

4 0
3 years ago
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