Answer:
30 m
Explanation:
Let's list out the known variables that we are given in this question.
- v₀ = 15 m/s
- v = 0 m/s
- t = 4 s
We are trying to solve for displacement in the x-direction.
Find which constant acceleration equation contains all 4 of these variables.
Plug the known values into the equation and solve for delta x.
The car goes 30 m after the driver begins to brake.
Explanation:
The concentration of salt after t minutes is given by :
A tank contains 9000 L of pure water. Brine that contains 40 g of salt per liter of water is pumped into the tank at a rate of 25 L/min.
We need to find the concentration approach at
So,
Put
Since,
C(t) = 40 g/L
So, at the concentration approaches to 40 g/L. Hence, this is the required solution.
Answer:
Explanation:
Intensity, Io = 14.5 W/m²
θ = 25°
By the law of Malus
I = 11.91 W/m²
Now the formula for the rms value of magnetic field is given by
Brms = 2.23 x 10^-7 tesla
Answer:
A) 200 j
B) 0 J
C) -100 J
D) -300 J
Explanation:
We know that change in potential energy is given as
where, mg is weight
yf and yi final and initial position
mg = 10 N
yf = 0 m
yi = 20 m
B) mg = 10 N
yf = 20 m
yi = 20 m
c) before fall from the drone
U = mgh
h = yf - yi = 20 - 30 = -10 m
D) point has 0 potential energy
mg = 10 N
h = yf -yi = 0 -30 = - 30 m
Answer: No, the student does not do any work on the wall.
Explanation: The work is defined as the movement of an object done/caused by a force.
And it can be calculated as:
W = F*d
where W is work, F is force and d is the displacement of the object
In this case, the student is applying force on the wall, so we have the first part, but we also know that the wall does not move, so in this case, d = 0, which would imply that the work applied to the wall must be equal to zero
(because W = F*0 = 0)
So the answer is no, the student does not do any work on the wall.