initial speed of the racer is given as
after applied force the final speed is given as
now during this speed change the racer will cover total distance 185 m
so here we will use kinematics
now the force that chute will exert on the racer will be given as
B) here following is the strategy for solving it
1. first we used kinematics to find the acceleration of the car
2. then we used Newton's II law (F = ma) to find the force
Answer:
C. perpendicular to one another and perpendicular to the direction of wave propagation.
Explanation:
An Electromagnetic wave (EM wave) is a wave having both electric and magnetic components in it. These wave radiates electromagnetic energy while propagating through the space. The electric and magnetic field component of the wave have an angle of 90° to each other aming them perpendicular while they both are perpendicular to the direction of wave propagation as well.
Some examples of EM waves are: UV rays, IR radiation, Radio waves etc. These waves propagate at the speed of light in vacuum.
Answer:
(a) 2450 J
(b) 0.0567 W
(c) 6347755 trees
Explanation:
mass of water, m = 50 kg
distance, h = 5 m
time, t = 12 hour = 12 x 3600 second = 43200 s
(a) Amount of work done, W = m x g x h = 50 x 9.8 x 5 = 2450 J
(b) Power is defined as teh rate of doing work .
Power = work / time = 2450 / 43200 = 0.0567 Watt
(c) Electrical power = 30 kWh
Time = 12 hour
Power = energy x time 30 x 12 = 360 kW = 360000 W
power by one tree = 0.0567 watt
Nuber of trees required = 360000 / 0.0567 = 6347755
Thus, the number of trees required are 6347755.
Answer:
They can be seen from a distance of 4.372 kilometers.
Explanation:
Using the Reyligh creterion for diffraction through a circular aperture we have
where symbol's have their usual meaning
thus applying values we get