Bone-strengthening physical activity done _____ increases bone-mineral content and bone density in youth.

Answer:

(a) 200.0628 N   ;   ( b) 4.08Kg

Explanation:

We know,

w = mg        [here w= weight , m= mass , g= gravity]

now,

gravity on earth (g) =9.807 m/s²

mass of the spanner (m)=?

weight of the spanner on earth(w) = 40N

                                              ⇒ w = 40N

                                              ⇒m g =40N

                                              ⇒m = (40/g) Kg

                                              ⇒m= (40/9.807)Kg

                                             ∴m=4.08Kg

∴mass of the spanner on earth = 4.08Kg

We know,

Mass is the amount of matter in an object . Somass will remain same both on earth and jupiter.

So,

(b)The mass of the spanner on jupiter =  4.08Kg

Now,

The mass of the spanner on jupitar (m) =  4.08Kg

Gravity on jupiter (g*) = 5.g              [5 times on earth]

                                   = 5 . (9.807)m/s²

                                   =49.035 m/s²

(a)    

∴weight of the spanner on jupitar(w*) = m g*

                                                            =(4.08 x 49.035) N

                                                            =200.0628 N

Solution:

Step wise solution

Let r1 be the distance from the Earth to the point where

the gravitational accelerations are the same and let r2 be the distance

from the Moon to that point.

Then, r1+ r2 = r12 = 383,000 km.

Let Re be the radius of earth

and let Rm be the radius of moon

Let, ge be the gravity of earth

and let gm be the gravity of moon

The fact that the gravitational attractions by the Earth and the Moon

at this point are equal leads to the equation

gE(Re/r1)=gM(Rm/r2)

9.8(6380/r1)=1.62(1738/r12-r1)              

(here, Re=6380, gE=9.8m/s^2,  gM=1.62m/s^2 and r12=383,000 km

9.8*6380/(1.62*1738)=r1/(383000-r1)

therefore,

r1=344,770 km

Hope this answer wil help you

Answer:

Calculate the distance between the center of the earth and the center of the moon at which the gravitational force exerted by the earth on an object is equal in magnitude to the force exerted by the moon on the object

Explanation:

solution steps