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zavuch27 [327]
3 years ago
11

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

So 115.84 km =115.84\times 10^3m

We know that 1 hour = 60×60 = 3600 sec

So 72.4miles/hour=\frac{72.4\times 1600m}{3600sec}=32.1777m/sec

7 0
3 years ago
The rectangular coils in a 345-turn generator are 12 cm by 12 cm. Part A
Likurg_2 [28]

Answer:

118.166 volt

Explanation:

We have given number of turns N =345

Sides of the rectangular coils is 12 cm =0.12 m

So area A =0.12×0.12=0.0144 m^2

Magnetic field B =0.45 T

Angular speed =505 rpm

Speed in rad/sec \omega =\frac{2\pi N}{60}=\frac{2\times 3.14\times 505}{60}=52.8566rad/sec

The emf is given by E=NAB\omega SIN\omega t

For maximum emf sinwt =1

So E=345\times 0.0144\times 0.45\times 52.8566=118.166volt

4 0
3 years ago
Why does water frozen in the cracks of a rock help to break down the rock? a) Water expands when frozen and chemically forces th
Gre4nikov [31]

Answer: B. water frozen in the cracks of a rock help to break down the rock because water expands when frozen, and physically forces the rock apart

6 0
3 years ago
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