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2 years ago

Which object has the most Kinetic Energy?

Physics

2 answers:

Rasek [7]2 years ago

4 0

Answer:

Explanation:

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barxatty [35]2 years ago

4 0

B because the ball is moving and it’s moving fast

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A rocket takes off from Earth and reaches a speed of 105 m/s in 18.0 s. If the exhaust speed is 1,200 m/sand the mass of fuel bu

Amanda [17]

Answer:

The initial mass of the rocket is 526.2 kg.

Explanation:

Given that,

Final speed = 105 m/s

Time = 18.0 s

Exhaust initial speed = 1200 m/s

Mass of burned fuel = 110 kg

We need to calculate the initial mass

The velocity change of rocket under gravity is defined as,

$v=u\ ln(\dfrac{m_{i}}{m})-gt$ ....(I)

We know that,

$m=m_{i}-m_{bf}$

Put the value of m in equation (I)

$v=u\ ln(\dfrac{m_{i}}{m_{i}-m_{bf}})-gt$

$m_{i}=\dfrac{m_{bf}}{1-e^-{\dfrac{v+gt}{u}}}$

$m_{i}=\dfrac{110}{1- e^-{\frac{105+9.8\times18}{1200}}}$

$m_{i}=526.2 kg$

Hence, The initial mass of the rocket is 526.2 kg.

7 0

2 years ago

Your friend wants to join the school track team, and has asked for your help to determine how fast she can run. 4. What kind of

DENIUS [597]

Answer:

I think you would need too time your friend and know how too divide that time by other racers to see how much faster she needs to get. I THINK.

7 0

2 years ago

Which moon has a thick atmosphere made mostly of nitrogen?

Delicious77 [7]

the answer is Titan
explanation: titan fascinates scientists because of its thick atmosphere — which is mostly made of nitrogen gas

7 0

2 years ago

Which four equations can be used to solve for acceleration

emmainna [20.7K]

The four equations for acceleration are obtained from the three equations of motion and from second law of motion.

Explanation:

Acceleration is defined as the rate of change of velocity with respect to time. So the change in velocity with respect to time can be determined using the three equations of motions.

So from the first equation of motion, v = u + at , we can determine the value of acceleration if time taken, final and initial velocity is known. The equation can be re-written as $a = \frac{v-u}{t}$

Similarly, from the second equation of motion, s = ut + 1/2 at², we can determine the equation for acceleration as $a = 2*\frac{s-ut}{t^{2} }$

So this is second equation for acceleration.

Then from the third equation of motion, $v^{2}- u^{2} = 2* a *s$

the acceleration equation is determined as $a = \frac{v^{2}-u^{2} }{2s}$

In addition to these three equation, another equation is present to determine the acceleration with respect to force from the Newton's second law of motion. F = Mass × acceleration. From this, acceleration = Force/mass.

So, these are the four equations for acceleration.

8 0

3 years ago

A 49.6-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.584 and 0.399,

NISA [10]

Answer:

(a) Force must be grater than 283.87 N

(B) Force will be equal to 193.945 N

Explanation:

We have given mass of the crate m = 49.6 kg

Acceleration due to gravity $g=9.8m/sec^2$