Physics, 26.04.2020 09:22 Marliii363782

An astronaut on Mars (mass 6.42x 10^23 kg, radius 3.39x 10^6 m) launches a probe straight upward from the surtace at 3.00x 10^3 m/s. What is the maximum height above the surface that the probe reaches? Neglect air resistance and the gravitational pull of
or the two small moons of Mars.

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Answer from: Quest

answer: a) y=-8x+5

a) m= -8

b) m= -2

c) m= 7

d) m= 6

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Answer from: Quest

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2 where t1=temperature of cold reservoir ( ° k) = 135 t2=temperature of hot reservoir ( ° k) = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58% note: this is the theoretical maximum efficiency of a perfect heat engine. real-life engines do not achieve this value.

Answer from: Quest

+10 that is always the common denominator

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An astronaut on Mars (mass 6.42x 10^23 kg, radius 3.39x 10^6 m) launches a probe straight upward fro...

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