Answer:
m=ρV
V=4/3 * pi * r3
V=1.3 * 3.14 * 3.9^3
V=242.14 cm^3
m=7.58 * 242.14
m=1.8 kG
Explanation:
1. We calculate volume for sphere.
2. Then we calculate mass of sphere.
The two ladybugs have same rotational (angular) speed
Explanation:
The rotational (angular) speed of an object in circular motion is defined as:
where
is the angular displacement
t is the time interval considered
Here we have two ladybugs, which are located at two different distances from the axis. In particular, ladybug 1 is halfway between ladybug 2 and the axis of rotation. However, since they rotate together with the disk, and the disk is a rigid body, every point of the disk cover the same angle in the same time 
: this means that every point along the disk has the same angular speed, and therefore the two ladybugs also have the same angular speed.
On the other hand, the linear speed of the two ladybugs is different, because it follows the equation:
where r is the distance from the axis: and since the two ladybugs are located at different 
, they have different linear speed.
Learn more about circular motion:
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A heat pump is a device that puts out heat. It involves pumping a lever over and over to get energy so it can work.
Answer:
The number of oscillations completed by the wave in one second is 1.88 number of oscillations
Explanation:
Frequency of a wave is defined as the number of oscillations completed by a progressive wave in one second. It is expressed as the ratio of the velocity of the wave to its wavelength.
Mathematically, frequency = velocity/wavelength
Given velocity of the wave = 9.2m/s
wavelength = 4.9m
Frequency = 9.2/4.9
Frequency = 1.88Hertz
The value of frequency of the wave gotten means that the wave completed 1.88 oscillations in one second.
Answer:
400m
Explanation:
use formula
velocity = displacement /time
