If you are lying down and stand up quickly, you can get dizzy or feel faint. This is because the blood vessels don’t have time t
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Answer:
The mass of the cube is 420.8 kg.
Explanation:
Given that,
Length of edge = 38.9 cm
Density
We need to calculate the volume of cube
Using formula of volume
We need to calculate the mass of the cube
Using formula of density
Hence, The mass of the cube is 420.8 kg.
Average velocity between t= 0 and t = 7.5 minutes = 7.4 m / s
<h3>Further explanation </h3>Regular straight motion is the motion of objects on a straight track that has a fixed speed
Formula used
S = distance = m
v = speed = m / s
t = time = seconds
The motion of objects can be expressed in graphical form
This relationship graph can be in the form of a graph S-t, v-t or a-t
From the S-t graph, the average speed can be determined by determining the slope distance of the curve line from the distance to time ratio
average velocity = distance traveled / time taken
From the statement of questions there are 3 stages of time that occur
- 1. first time
move with v = 12 m / s, t = 1.5 min = 90 s
So the distance traveled =
s = v x t
S = 12. 90
S = 1080 m
- 2. second time
stop (v = 0) so that s = 0 and t = 3.5 min = 210 s
- 3. third time
move with v = 15 m / s and t = 2.5 min = 150 s
so the distance traveled
s = v x t
s = 15 x 150
s = 2250 m
Total distance = 2250 + 1080 = 3330 m
If we look at the existing chart (attached)
then we can draw a straight line from the starting point to the end point so we get a slash curve that shows the average speed
v average = distance traveled / time taken
v average = 3330/450
v average = 7.4 m / s
<h3>Learn more </h3>
The distance of the elevator
velocity position
resultant velocity
Keywords: average velocity, Motion of objects, s-t graph
