#6-11 6. A mass of 6 kg is dropped from a height of 1 meter. The earth is 1024 t

Question

#6-11 6. A mass of 6 kg is dropped from a height of 1 meter. The earth is 1024 times more massive. The acceleration of the earth towards the mass is? b. gx1024 c.gx10-24 2 e. none of these a. g d. 60 m/s 7. A block is resting on a frictionless horizontal surface. The "Normal force is equal to the weight because? a. Newton's 3d law b. friction is zero c. velocity is O d. sum of forces must be O 10. A car having a total mass of 2250 kg moving at 2 m/s smashes into a tree, stopping in 2.5 seconds. The average force acting on the car during the collision is (units of N) a. 0.8 b. 1800 c. 11250 d. 2812.5 e. none of these 11. A car traveling at 100 km/hr strikes a bug and splatters it. The force of impact is, a. the same for both b. greater for the bug c. greater for the car

Explanation / Answer

6.

Every body can attract the other body with equal force from gravitational force of attraction

let m1= 6kg, and m2 = 6*10^24 kg

the force F1 = m1*g the force by the earth on mass

and F2 = m2g , force on the earth by mass

we know that F1 = F2

m1*g1 = m2*g2

g2 = m1*g1/m2

g2 = m1*g1/(10^24*m1)

g2 = g1*10^-24

here g1 = g

so the acceleration of the earth due to mass is g*10^-24

the answer is option c

------

7.

Block is at rest on the frictionless surface , the normal force equal to the weight

because of the net forces equal to zero

due to which the block is at rest

answer is optiond d

--------

10.

mass of car mc = 2250 kg, initial velocity u = 2 m/s

dt = 2.5 s

average force on the car during the collision is F = ?

frin impulse momentum theorem F*dt = m(dV)

F = m(dV/dt)

F_avg = m(dV/dt)

aubstituting the values

F_Avg = 2250(0-2)/(2.5) N

F_avg = -1800 N

F_avg = 1800 N

-------

11.

if the car strikes the bug means the force applied on the bug id equal to the force exerted by the bug on car

so the answer is option a. the force of impact is the same for both

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.