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3 years ago

A skateboarder rolls down the sidewalk with an initial velocity of 0 m/s. If her acceleration is

Physics

1 answer:

VikaD [51]3 years ago

3 0

Answer:

80m/s

Explanation:

to find it you have to work it out by using the formula distance divided by speed to find time.

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If you increase your work and decrease your time, you will haveA. more power.less power.the same amount of power.power rating ca

LenaWriter [7]

You will have the same amount of power.

One way to look at this is:
If you work for 10hours at a normal rate (which we’ll call one) then 10x1 is 10. Your power is still at 10

If you work for 5 hours, but twice as hard, then you do 5x2 which is ten. The amount of power is always the same

6 0

3 years ago

if a bullet of unknown mass is fired from a gun with 50m/s. such that the recoil of the gun is -0.3m/s if the mass of gun is 8 k

Mademuasel [1]

Answer:

1333.34 kg

Explanation:

Given that,

The mass of the gun, m = 8 kg

Speed of the bullet, V = 50 m/s

The recoil speed of the gun, v = -0.3 m/s

We need to find the mass of the bullet. Using the conservation of momentum to find it. Let M is the mass of the bullet.

$mv=MV\\\\M=\dfrac{mv}{V}\\\\=\dfrac{50\times 8}{0.3}\\\\=1333.34\ kg$

So, the mass of the bullet is 1333.34 kg.

4 0

3 years ago

In the aerials competition in skiing, the competitors speed down a ramp that slopes sharply upward at the end. The sharp upward

11111nata11111 [884]

Answer:

u = 11.6 m/s

Explanation:

The end of a launch ramp is directed 63° above the horizontal. A skier attains a height of 10.9 m above the end of the ramp.

Maximum height, H = 10.9

Let v is the launch speed of the skier. The maximum height attained by the projectile is given by :

$H=\dfrac{u^2\ sin^2\theta}{g}$

$10.9=\dfrac{u^2\ sin^2(63)}{9.8}$

u = 11.6 m/s

So, the launch speed of the skier is 11.6 m/s. Hence, this is the required solution.

4 0

3 years ago

If A and B are two objects with masses 6 kg and 34 kg respectively then

Mademuasel [1]

Answer:

the object B has more mass (= 34 kg) than the object A (= 6 kg)................................ ᕦ( ᐛ )ᕡ

4 0

4 years ago

An airplane travels 2400 km at a speed of 600 km/h, decreases its speed to 400 km/h for the next 1200 km and travels the last 2,

Alexus [3.1K]

Forget the numbers and think about how speed works for a second. If a plane flies at 600km/h, this means that it will fly exactly 600 km in 1 hour. So, how long would it take to fly 2400 km??

2400/600 = 4hours.

Do this for all three and add up the hours.

Total time: 12 hours

Average speed is the total distance / total time.

So,

Add up all the distances and divide by 12.

(2400+1200+2500) / 12

Average speed: 508.33333333 km/h

7 0

3 years ago