Answer:

Explanation:
density of the solid box material = 
density of the liquid material = 
Given that
solid box floats with two thirds of its volume submerged in a liquid
let V be the volume of the box
then,

⇒
so, the ratio of densities of solid and and the liquid is 2/3
Answer: 9.09 seconds
Explanation:
Given that,
speed of sound = 330 m/s
Distance away = 3 km
(since the SI unit of distance is metres, convert 3km to metres
1km = 1000 metres
3km = (3 x 10000) = 3000 metres
Time it take for the sound to reach you = ?
Now, recall that speed is obtained by dividing distance travelled by the time taken.
i.e speed = distance / time
330 m/s = 3000 m / time
Time = 3000 m / 330 m/s
Time = 9.09 seconds
Thus, it will take 9.09 seconds for the sound to reach you.
<span>an action that can cause an object to move or change its state of motion is force</span>
You reach the max amplitude when all the energy is in the spring and the kinetic energy of the ball is zero.
Answer:
Friction = 15.80 Newton
Explanation:
given
A pulling force (F) is 70N acting on the block of 10kg (M) which is placed on the ramp which is at an angle of 20° with the horizontal.
Irrespective to the ramp ,Weight of the body acts vertically downward , if we resolve the components of W=Mg as Mgsin20° (along the ramp) and Mgcos20° (perpendicular to the ramp) as shown in the attachment which contains FBD of the block
as given the body is Accelerating with an acceleration (a) of 2 m/
due to the pulling force . As friction always opposes the motion it acts in the backward direction to the pulling force .as shown in the figure attached
By Newton's 2nd Law
Ma = F - MgSin20°-friction
by subtituting the values we get
10(2) = 70 - 10(10)sin20° - friction
friction =70 - 100sin20° -20
friciton = 15.7979N
by rounding of ,
Frictional force is 15.80 Newton