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The velocity of the boat relative to an observer standing on either bank = u = 18 
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Explanation:
Let speed of the boat in still water = u
speed of the river water = v
Relative speed of the boat in the water against the river flow is given by
Upstream speed = u - v ------- (1)
⇒ u - v = 12 ------ (2)
Given that speed of the water = 6
Now velocity of the boat is given From equation (2)
⇒ u = 12 + v
Put the value of v = 6 , we get
⇒ u = 12 + 6
⇒ u = 18
therefore , the velocity of the boat relative to an observer standing on either bank = u = 18
Answer:
Time of race = 10.18 s
Explanation:
She keeps this acceleration for 17 m and then maintains the velocity for the remainder of the 100-m dash
Time to travel 17 m can be calculated
s = ut + 0.5at²
17 = 0 x t + 0.5 x 3.89 x t²
t = 2.96 s
Velocity after 2.96 seconds
v = 3.89 x 2.96 = 11.50 m/s
Remaining distance = 100 - 17 = 83 m
Time required to cover 83 m with a speed of 11.50 m/s
Time of race = 2.96 + 7.22 = 10.18 s
<1, 2, 3> x (7.6 <-5.3, -4.8, -3.9>) x stands for cross product
What does the above notation mean?
Multiply 7.6 to each component of the velocity vector to obtain the linear momentum vector. Find the cross product of the position vector and the linear momentum vector. That gives you the angular momentum vector.
7.6 * -5.3 = -40.28
7.6 * -4.8 = -36.48
7.6 * -3.9 = -29.64
Cross Multiplication
-40.28 1 = -80.56 - (-36.48)
-36.48 2
-40.28 1 = -120.84 - (-29.64)
-29.64 3
-36.48 2 = -109.44 - (-59.28)
-29.64 3
answer is (-91.2) - (50.16) + 117.04 = -24.32
Explanation:
Potential energy is the energy occupied by an object or substance due to its position.
For example, a sled drops 20 meters in height on a hill shows that a decrease in height is taking place.
Hence, potential energy is involved there.
Kinetic energy is the energy acquired by an object due to its motion.
For example, a rider is going 20 m/s at the bottom of the hill shows that rider is in motion due to which it has kinetic energy.
You make them strong for example if you rub a balloon in your hair the longer you do it the longer it sticks because of static
