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mariarad [96]
2 years ago
5

Really need help with this Physics question!

Physics
1 answer:
mojhsa [17]2 years ago
8 0

As we know that block of steel is continue to be in moving state

so here the friction must be kinetic friction between two surface

so we know that formula of kinetic friction must be

F_k = \mu_k mg

now we have

\mu_k = 0.57

mg = 25 N

now from the above equation we have

F_k = 0.57\times 25

F_k = 14.25 N

So here we need atleast 14.25 N force to continue sliding the box now as per given options all forces which are less than 14.25 N is not correct

Hence correct answer must be 18.0 N

<u>D) 18.0 N</u>

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A man (weighing 763 N) stands on a long railroad flatcar (weighing 3513 N) as it rolls at 19.8 m/s in the positive direction of
Burka [1]

Answer:

0.8m/s

Explanation:

Weight of mas,F=763 N

Mass of man=\frac{F}{g}=\frac{763}{9.8}=77.86 kg

By using g=9.8m/s^2

Weight of flatcar=F'=3513 N

Mass of flatcar=\frac{3513}{9.8}=358.5 Kg

Total mass of the system=Mass of man+mass of flatcar=77.86+358.5=436.36 kg

Velocity of system=19.8m/s

Let v be the velocity of flatcar with respect to ground

Velocity of man relative to the flatcar=-4.68m/s

Final velocity of man with respect to ground=v-4.68

By using law of conservation of momentum

Initial momentum=Momentum of car+momentum of flatcar

436.36(19.8)=77.86(v-4.68)+358.5v

8639.928=77.86v-364.3848+358.5v

8639.928+364.3848=436.36 v

9004.3128=436.36v

v=\frac{9004.3128}{436.36}

v=20.6 m/s

Initial speed of flatcar=Speed of system

Increase in speed=Final speed-initial speed=20.6-19.8=0.8m/s

4 0
2 years ago
An object is being pulled to the right. To make the object move to the left, you would have to apply a force to the left that is
vlada-n [284]
Greater than is the answer. Pulling an equal force provides no acceleration and no movement. Pulling less than would still cause the object to move to the right.
5 0
3 years ago
Read 2 more answers
A ball has mass of 140g. what is the force to accelerate the ball at 25m/s
Fittoniya [83]

We know, F = m * a

Here, m = 140 g = 0.140 Kg

a = 25 m/s2

It would be: F = 0.140 * 25 = 3.5 N

So your answer would be 3.5N


6 0
3 years ago
Read 2 more answers
Light travels approximately 982,080,000 ft/s, and one year has approximately 32,000,000 seconds. A light year is the distance li
Anastasy [175]

Answer: 3.142656 × 10^16 feet

Explanation: Given that the

Speed = 982,080,000 ft/s, and

Time = 32,000,000 seconds

The formula for speed is:

Speed = distance/ time

Make distance the subject of formula

Since the time is second in one year and speed is ft/s, substitute both into the formula

Distance = speed × time

distance = 982,080,000 × 32,000,000

Distance = 3.142656 × 10^16 feet.

The distance of one light year in feet is 3.142656 × 10^16

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3 years ago
Order the sounds made by these sources from highest to lowest pitch.
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Answer:

c

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