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3 years ago

10

How much force is required to keep 780 n box moving at constant velocity across the floor of the friction force between the box

and the floor is 160 n

1 answer:

Vladimir [108]3 years ago

7 0

Answer:

160N force requred

Explanation:

160N force required to move the block with constant velocity.

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______ 4. Justin was creating a chart comparing the potential energy between charged particles and the potential energy of magne

fredd [130]

Answer:

The correct option is;

A. The potential energy between both like charges and like poles increases as they move closer together

Explanation:

Here we have that when we move the like poles of two bar magnets close to each other, there is an increased resistance in the continuing motion, therefore for each extra gap closer achieved, there is an increase in potential energy

Similarly, when two like charges are brought closer together, the potential energy, or the energy available to push the two like charges apart increases charge as the as the charges are brought closer together

Therefore, the correct option is the potential energy between both like charges and like poles increases as they move closer together.

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3 years ago

Betty hits a baseball.

lorasvet [3.4K]

Answer:

point 2

Explanation:

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Density of water is 1000 kg/m3 and that of glass is 2500 kg/m3 . The speed of light will be maximum in

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Water I believe sorry if wrong

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3 years ago

Helicopter blades withstand tremendous stresses. In addition to supporting the weight of a helicopter, they are spun at rapid ra

BabaBlast [244]

Explanation:

It is given that,

Length of the helicopter, l = 3.1 m

The helicopter rotates, the length of helicopter will become the radius of circular path, r = 3.1 m

Angular speed of the helicopter, $\omega=280\ rev/min=29.32\ rad/s$

(a) The centripetal acceleration in terms of angular velocity is given by :

$a_c=r\times \omega^2$

$a_c=3.1\times (29.32)^2$

$a_c=2664.95\ m/s^2$

(b) Let v is the linear speed of the tip. The relation between the linear and angular speed is given by :

$v=r\times \omega$

$v=3.1\times 29.32$

v = 90.89 m/s

$\dfrac{v_{tip}}{v_{sound}}=\dfrac{90.89}{340}=0.267$

Hence, this is the required solution.

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3 years ago

An automobile which set the world record for acceleration increase speed from rest to 96 km/h in 3.07 seconds what distance trav

Vesnalui [34]

Answer:

41.02m

Explanation:

Given parameters:

Initial velocity = 0m/s

Final velocity = 96km/hr

Time taken = 3.07s

Unknown:

Distance traveled by the time the final speed was achieved = ?

Solution:

To solve this problem, we first find the acceleration of the car;

Acceleration = $\frac{v - u }{t}$

v is the final velocity

u is the initial velocity

t is the time taken

Now convert the the final velocity to m/s;

96km/hr to m/s;

1 km/hr = 0.278m/s

96km/hr = 96 x 0.278 = 26.7m/s

Now;

Acceleration = $\frac{26.7 - 0}{3.07}$ = 8.69m/s²

So;

v² = u² + 2as

v is the final velocity

u is the initial velocity

a is the acceleration

s is the distance

26.7² = 0² + 2 x 8.69 x s

712.89 = 17.38s

s = 41.02m

3 0

3 years ago