b. Ignoring friction, in what direction will the pitcher accelerate when she thr
ID: 1731316 • Letter: B
Question
b. Ignoring friction, in what direction will the pitcher accelerate when she throws the ball? (1 point) 3. A spacecraft is currently moving through empty space at a speed of 35 km/s. a. With no forces acting on the spacecraft, how will its speed change over time? How do you know? (1 points) b. By magic, a large planet appears directly behind the spacecraft. What effect will the planet's gravity have on the spacecraft's motion? (Consider both speed and direction.) (1 point) c. The planet has a mass equal to 6x1024 kg and is located 108 m behind the spacecraft, which has a mass of 1000 kg. Ignoring the gravitational constant G, what is the gravitational force exerted on the spacecraft by the planet? (2 points)Explanation / Answer
(b) the pitcher will move (accelerate ) opposite to motion of ball.
(due to newton's third motion of law - both will exert same force on each other)
Q.3
(a) Thrust force applied by engine of spacecraft.
when spacecraft release some fuel or gas then that gas accelerates relative to stationary space.
by newton's third law this gas will exert equal and opposite force on spacecraft and this force by gas is responsible for the motion of spacecraft.
(b)
the spacecraft's velocity will become perpendicular to line joining the spacecraft and planet to balance the gravitational pull of planet by centrifugal force.
(c)
Fg = Gm1m2/r2
Fg = G(6*1024)(1000)/(108)2
Fg = 6G*1011 newton
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