Question

question 7 1 pts a push on a 1 - kg brick accelerates it. neglecting friction, equally accelerating a 10 - kg brick requires 100 times as much force. one - tenth the amount of force. 10 times as much force. just as much force. none of the above question 8 1 pts a rock weighs 30 n on earth and another rock weighs 30 n on the moon. which rock has the greater mass? the one on the moon they have the same mass. the one on earth not enough information

Explanation:

Question 7

Step1: Recall Newton's second law

$F = ma$ (where $F$ is force, $m$ is mass, and $a$ is acceleration).

Step2: Let the acceleration be $a$ for both bricks

For 1 - kg brick, $F_1=1\times a = a$. For 10 - kg brick, $F_2 = 10\times a=10a$. So $F_2 = 10F_1$.

Question 8

Step1: Recall weight formula

$W=mg$ (where $W$ is weight, $m$ is mass, and $g$ is gravitational acceleration). On Earth, $g_E\approx9.8\ m/s^2$, on Moon, $g_M\approx1.62\ m/s^2$.

Step2: Calculate mass for each rock

For Earth - rock, $m_E=\frac{W}{g_E}$. For Moon - rock, $m_M=\frac{W}{g_M}$. Since $g_E>g_M$ and $W$ is the same for both, $m_M > m_E$.

Answer:

Question 7: C. 10 times as much force.
Question 8: A. the one on the Moon.