Answer:
Explanation:
Equation of the rocket is,
Here, v' is the relative velocity of rocket.
In space F is zero.
So,
Now the momentum can be obtained by multiply by m on both sides.
Now for maxima,
Now,
Therefore, the mass of the rocket while having maximum momentum is
Answer:
the assessment is due at 11 you only have 1 hour do it fasst
Explanation:
the assessment is due at 11 you only have 1 hour do it fasst
Answer:
12 m
Explanation:
Hi! The ecplanation is based on the figure. Lets call the mirrors M1 and M2. Your head is the triangle called A, facing towards M1
Then:
A' is the image (virtual) of A given by M1. This is the image of your face.
A'' is the image of A given by M2. This image A'' when reflected by M1 produces image A'''. This is the image of the back of your head you see. It is 12 m away of you.
Answer:
Her speed at the bottom of the slide is 7.42 m/s
Explanation:
From the question,
The swimmer starts at rest, that is, her initial speed, u is 0 m/s.
Since she slides without friction and descends through a vertical height, then it is a free fall motion (due to gravity).
Also, from the question,
She descends through a vertical height of 2.81 m.
To determine her speed at the bottom of the slide, that is her final speed,
From one of the equations of motion for freely falling bodies
v² = u² + 2gh
Where v is the final speed
u is the initial speed
g is acceleration due to gravity (g = 9.8 m/s²)
and h is height
From the question,
u = 0 m/s
h = 2.81 m
Putting the values into the equation
v² = u² + 2gh
v² = 0² + 2×9.8×2.81
v² = 55.076
v =√55.076
v = 7.42 m/s
Hence, her speed at the bottom of the slide is 7.42 m/s.
Answer: The two places altitudes are: 16.17 m and 40.67 m
Explanation:
Hi!
Lets call z to the vertical direction (z= is ground) . Then the positions of the balloon and the pellet, using the values of the velocities we are given, are:
How do we know the value of t₀? This is the time when the pellet is fired. At this time the pellet position is zero: its initial position. To calculate it we know that the pellet is fired when the ballon is in z = 12m. Then:
We need to know the when the z values of balloon and pellet is the same:
We need to find the roots of the quadratic equation. They are:
To know the altitude where the to objects meet, we replace the time values: