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4 years ago

A machine does 1500 joules of work in 30 second What is the power of the machine

1 answer:

8 0

This is simple as power in watts is equal to joules per second so we can do 1500 joules divided by 30 seconds which equals 50 watts

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now suppose that we have attached not just two springs in series, but N springs. Write an equation that expresses the effective

sammy [17]

Answer:

$k_{eq} = \frac{k}{N}$

Explanation:

For this exercise let's use hooke's law

F = - k x

where x is the displacement from the equilibrium position.

x = $- \frac{F}{k}$

if we have several springs in series, the total displacement is the sum of the displacement for each spring, F the external force applied to the springs

x_ {total} = ∑ x_i

we substitute

x_ {total} = ∑ -F / ki

F / k_ {eq} = -F $\sum \frac{1}{k_i}$

$\frac{1}{k_{eq}} = \frac{1}{k_i}$ 1 / k_ {eq} = ∑ 1 / k_i

if all the springs are the same

k_i = k

$\frac{1}{k_{eq}} = \frac{1}{k} \sum 1 \\$

$\frac{1}{k_{eq} } = \frac{N}{k}$

$k_{eq} = \frac{k}{N}$

6 0

3 years ago

What is the accleration of a car that travels 10 meters in 2seconds

guajiro [1.7K]

If it happens to be cruising along at 5 meters per second (about
11 miles per hour), then it covers 10 meters in 2 seconds without
any acceleration at all.

5 0

3 years ago

dayshawn is traveling at 12 m/s away from the school. dayshaun's mom is looking for him because he is late coming home so she le

vivado [14]

Speed of Dayshawn travelling towards his home is 12 m/s

Speed of her mom towards his school is 5 m/s

They both starts at same time so whenever they will meet on their path the sum of the distance covered by Dayshawn and distance covered by his mom must be equal to the total distance of school and home

Now let say they both meet after "t" time when they starts motion

so we can write the total distance between school and home as

$d = v_1*t + v_2*t$

here d = 6492 m

$v_1 = 12 m/s$ = speed of dayshawn

$v_2 = 5 m/s$ = speed of his mom

now by solving the above equation

$6492 = 12t + 5 t$

$t = \frac{6492}{17}$

$t = 381.9 s$

so they will meet after 381.9 s from start which will be 3.36 minutes from there start

Also at this time the distance covered by her mom will be

$d_2 = v_2*t$

$d_2 = 5* 381.9 = 1909.4 m$

so they will meet at distance 1909.4 m from their home

4 0

3 years ago

A satellite with a mass of 120 kg fires its rocket thrusters, which give an impulse of 7440 kg-m/s. What was the total change in

Marat540 [252]

From the calculation and the momentum of the body, the velocity is 62 m/s

<h3>What is momentum?</h3>

The term momentum refers to the product of mass and velocity. Now recall that the rate of change of momentum is equal to the impressed force.

Hence;

7440 kg-m/s = 120 kg * v

v= 7440 kg-m/s/120 kg

v = 62 m/s

Learn more about momentum:brainly.com/question/24030570

#SPJ1

3 0

2 years ago

Which of the following is NOT a unit of measurement for speed?

Dmitriy789 [7]

I don't see any units of measurement or speed I don't see anything

3 0

3 years ago

Read 2 more answers