A. 205 cm
This has 3 significant figures: 2,0 and 5.

B. 0.00004 cm
This has 1 significant figure: 4

C. 20 cm
This has 2 significant figures: 2 and 0.

D. 20. cm
This has 2 significant figures: 2 and 0

7 0

3 years ago

How much force is needed to accelerate a 3 kg skateboard at 5 m/s2

Umnica [9.8K]

The problem is fairly simple if you use the formula.

Formula: Force = (mass) x (acceleration)

3 x 5 = 15 newtons

Note: 3 kg is the mass of the skateboard, and 5 m/s2 is the acceleration.

Answer: 15 newtons

3 0

3 years ago

Read 2 more answers

A(n) 0.47 kg softball is pitched at a speed of 10 m/s. The batter hits it back directly at the pitcher at a speed of 29 m/s. The

nadya68 [22]

Answer:

18.33 Ns

Explanation:

As the pitch back speed has the opposite direction as before, the change in velocity would be

$\Delta v = v_2 - v_1 = 29 - (-10) = 39 m/s$

So the change in momentum of the ball would be the product of its velocity change and its mass

$\Delta p = \Delta v m = 39 * 0.47 = 18.33 kgm/s$

This is equals to the impulse acted on the ball by the bat, which is 18.33 Ns

8 0

3 years ago