Answer:
The current flows through the rod is 14.9 A.
Explanation:
Given that,
Magnetic field = 0.045 T
Mass of aluminum rod = 0.19 kg
Length = 1.6 m
Angle = 30.0°
We need to calculate the force
Using resolving force


Put the value into the formula


We need to calculate the current flows through the rod
Using formula of magnetic force


Put the value into the formula

Hence, The current flows through the rod is 14.9 A.
There are mistakes in the question as the unit of speed and height is not mention here.The correct question is here
A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 16.0m/s when the hand is 1.80m above the ground.How long is the ball in the air before it hits the ground? (The student moves her hand out of the way.)
Answer:
t=3.37s
Explanation:
Given Data
As we have taken hand at origin and positive upward
So given data are

To find
time taken by the ball before it hits the ground
Solution
By using the common kinematic equation

Put the given values and find for t
So

Apply quadratic formula to solve for t
Answer
given,
mass of raindrop = 5.4 × 10⁻⁷ kg
acceleration due to gravity = 9.8 m/s²
a) magnitude of gravitational force on the rain drop
Force on the rain drop = m g
Force on the rain drop = 5.4 × 10⁻⁷ x 9.8
= 5.292 x 10⁻⁶ N
Hence, force on raindrop by earth is equal to 5.292 x 10⁻⁶ N
b) by newtons third law
Force by the earth on the raindrop will be opposite to the force by raindrop on earth.
Force on earth by raindrop = - 5.292 x 10⁻⁶ N
negative sign represent that force is acting in the opposite direction.
Answer:
Explanation:
y1 = 16.2/2 = 8.1 cm
d = 1.22 lambda D/y1
d = 1.22 x 657 x 10^-9 x 23.7/0.081
d = 2.35 x 10^-4 m = 234.52 um