Explain how buoyancy can defeat the force of gravity

Physics

1 answer:

Olenka [21]3 years ago

7 0

Answer:

Buoyancy causes things to float in water or liquid which appears to defeat the force of gravity. Hope this helps.

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A rocket ship starts from rest and turns on its forward booster rockets, causing it to have a constant acceleration of 4 \,\dfra

Sergio039 [100]

Answer:

+12 m/s

Explanation:

The velocity of an object moving of accelerated motion is given by:

$v(t) = v_0 +at$

where

v0 is the initial velocity of the object

a is the acceleration

t is the time

In this problem, the rocket starts from rest, so $v_0 =0$ . The acceleration is $a=4 m/s^2$ , so the velocity after $t=3 s$ will be

$v(3 s)=0 +(4 m/s^2)(3 s)=+12 m/s$

6 0

3 years ago

Two solid spheres of radius R made of the same type of steel are placed in contact. The magnitude of the gravitational force the

dimulka [17.4K]

F1 = G * m*m / [2r] ^2 = G * m^2 / 4r^2

Given the the mass is proportional to the volume and the volume is proportional to r^3, the mass of each big sphere is 3^3 = 27 times the mass of the small spheres. And the distance between the centers is 3r + 3r = 6r

F2 = G * [27m * 27m]/* [6r]^2 = G* 27^2 m^2 / 36r^2 = 81 G*m^2 / 4r^2 = 81*F1

Therefore, F2 = 81F1

Answer: option D) 81F1.

3 0

3 years ago

Change a speed of 72.4 miles per hour to its equivalent in meters per second.

4vir4ik [10]

Answer:

Speed in meter/sec will be 32.1777 m /sec

Explanation:

We have given speed = 72.4 miles per hour

We have to convert this speed in meter per second

We know that 1 miles = 1.6 km

So 72.4 miles = 72.4×1.6= 115.84 km

We also know that 1 km = 1000 m