Explanation:
Watts are defined as 1 Watt = 1 Joule per second (1W = 1 J/s)
which means that 1 kW = 1000 J/s. A Watt is the amount of energy (in Joules) that an electrical device (such as a light) is burning per second that it's running.
Refer to the diagram shown below.
h = height of the girl above water when she lets go of the rope.
The launch velocity is 22.5 m/s at 35° to the horizontal. Therefore the vertical component of the velocity is
v = 22.5 sin(35°) = 12.9055 m/s.
The time of flight is t = 1.10 s before the girl hits the surface of the water at a height of -h.
Therefore
-h = (12.9055 m/s)*(1.10 s) - (1/2)*(9.8 m/s²)*(1.10 s)²
-h = 8.267 m
= 8.3 m (nearest tenth)
Answer:
When the girl let go of the rope, she was about 8.3 m above the surface of the water.
To solve this problem it is necessary to apply the concepts related to the thermal transfer rate. In general, the transfer rate can be expressed as
Where,
k = Thermal conductivity
A = Cross-sectional area
= Change of temperature
L = Length
Since the two heat transfer rates are equivalent we have to:
Replacing we have,
Therefore the temperature where the two bars are joined together is 300°C
An object moving in a circle wants to move in a straight line.
The motion of an object is tangent to the circle.
Tangential speed remains constant for an object with uniform circular motion.
Only the direction of the object changes, which means velocity is changing and the object is accelerating
Complete Question
Electromagnetic radiation from a 3.00 mW laser is concentrated on a 2.00 mm2 area. Suppose a 6.00 nC electric charge is in the beam. What is the maximum electric force (in N) it experiences? If the static charge moves at 300 m/s, what maximum magnetic force (in N) can it feel?
Answer:
The value are
and
Explanation:
From the question we are told that
The power of the laser is
The area is ]
The speed is
The magnitude of the electric charge is
Generally the intensity of the beam is mathematically represented as
=>
=>
Generally the magnitude of the electric field is mathematically represented as
Here c is the speed of light with value
is the permittivity of free space with value
=>
Generally the maximum electric force is mathematically represented as
=>
=>
Generally the intensity of the beam can also be mathematically represented as
Here B is the magnetic field
is the permeability of free space with value
So
=>
=>
Generally the maximum magnetic force is mathematically represented as
=>
=>