The acceleration of gravity is 9.8 m/s². That means that when something
is falling here on Earth, its speed increases by 9.8 m/s every second that
it falls. In other words, whenever you look at it, it's falling 9.8 m/s faster
than it was falling one second earlier.
If you drop an object from some high place ... high enough that it can
keep falling for 6 seconds and not hit the ground yet ... it falls 9.8 m/s
faster every second, and at the end of 6 seconds, it's falling at
(6) x (9/8 m/s) = 58.8 meters per second.
At the beginning of the 6 seconds, its speed was zero.
At the end of the 6 seconds, its speed is 58.8 meters per second.
Its AVERAGE speed over the period of 6 seconds is
(1/2) (0 + 58.8 m/s)
= 29.4 meters per second .
Distance = (average speed) x (time)
= (29.4 m/s) x (6 sec)
= 176.4 meters .
BTW ... Jordan may be in trouble. I'm pretty sure it's illegal
in New York City to drop anything off of a tall building.
If someone happens to be walking by the building at that
particular moment, or 6 seconds later, getting hit in the head
by a penny falling at 58.8 m/s (about 132 mph !) can really
smart, and can muss your do for the rest of the day.
F=ma
F = 148×(85-35)÷20
F = 148×(50÷20)
F = 148×2.5
F = 370N
Answer:
3.04 m/s
Explanation:
As the woman moves north, the raft moves south.
We then make the following assumptions for easier calculations
Let the motion of the woman = x
Let the motion of the raft = 4.2 - x
Using law of momentum, we see that
m*v = m1*v1, where
m = 56 kg
v = x
m1 = 149 kg
v1 = (4.2 -x)
Substituting the values into the equation, we have
56 * x = 149 (4.2 - x), opening the bracket
56x = 623 - 149x collecting like terms
205x = 623 Divide by 205
x = 623/205
x = 3.04 m/s
This then means that our answer is 3.04 m/s
Answer:
Explanation:
E₀ = 229.1 V/m
E = E₀ / √2 = 229.1 / 1.414 = 162 V/m
B = E / c ( c is velocity of em waves )
= 162 / (3 x 10⁸) = 54 x 10⁻⁸ T
rate of energy flow = ( E x B ) / μ₀
= 162 x 54 x 10⁻⁸ / 4π x 10⁻⁷
= 69.65 W per m².
I would say B. A stable home and varied activities