An astronaut on the planet Zircon tosses a rock horizontally with a speed of 7.15 m/s. The rock falls through a vertical distance of 1.40 m and lands a horizontal distance of 8.95 m from the astronaut. What is the size of the acceleration due to gravity on Zircon

Explanation:

horizontal velocity, u = 71.5 m/s

height, h = 1.4 m

horizontal distance, d = 8.95 m

Let the time is t and the value of acceleration at that planet is a.

Use second equation of motion

d = u t ( acceleration in horizontal direction is zero)

8.95 = 71.5 x t

t = 0.125 s

Use second equation of motion in vertical direction

h = 1/2 at²

1.4 = 1/2 x a x 0.125 x 0.125

a = 17.2 m/s²

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2