Atree branch is floating in water. the total volume of the branch is 1.12 m3 and 75.0 percent of the volume is submerged. the density of water is 1000 kg/m3. find the mass of water displaced by the branch

Mass = Density x Volume.

You are given the density of the water, you need to find the volume of the branch that is submerged.

Volume of the branch that is submerged= 1.12 x 0.75 = 0.84 m^3

Now find the mass of the water:

Mass = 1000 x 0.84 = 840 kg.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form