Answer:
<h2>57166.6N</h2>
Explanation:
Step one:
given data
mass=700kg
initial velocity u=29m/s
final velocity=4.5m/s
time t= 0.3second.
Step two:
The expression for the momentum is given as
FΔt=mΔv
make F subject of the formula
F=mΔv/Δt
Substitute our given data we have
F=700(29-4.5)/0.3
F=700*24.5/0.3
F=17150/0.3
F=57166.6N
the force is 57166.6N
Given that the space station is free of gravitational force, it is required that it spins an certain speed to acquire centripetal acceleration.
In this case, you want that the centripetal acceleration, Ac, equals g (gravitational acceleration on the earth), becasue this will cause a centripetal force equal to the weight on earth.
The formula for centripetal acceleration is Ac = [angular velocity]^2*R
where R = [1/2]50.0m = 25.0 m
Ac = 9.81 m/s^2
=> [angular velocity]^2 = Ac/R = 9.81m/s^2v/ 25.0m = 0.3924 (rad/s)^2
[angular velocity] = √(0.3924) rad/s = 0.63 rad/s
Answer: 0.63 rad/s
Answer:
Explanation:
The location, orientation, size, and type of image formed by a convex lens are related to the position of the image location in front of the lens
Object >2·F = The image formed by a convex lens when the object is located more than twice the focal length from the lens
Object < F = The image formed by the convex lens when the object is located between the lens and the focal length
Answer:
1. The reason why nichrome wire is used in a heater is due to the properties of nichrome which makes it a material of choice for heating application including;
i) The cost of manufacture of nichrome is low
ii) Nichrome has both high mechanical and creep strength, and therefore is suitable for installation and use in a wide setting
iii) Nichrome has a high resistance to electron flow, making it a good electrical heating element
iv) Nichrome has a high resistance to oxidation, such that it can be reused several times as a heater
v) The high ductility of nichrome allows it to be stretched and drawn around different vessels with contents to which heat is to be supplied
2. Copper wire is not used in heaters because according to Joule's law, the heat produced from the flow of electric current, 'I', through a material having a resistance, 'R', for a time, 't', is proportional to I²·R·t, and copper has a very low resistance, 'R', to the flow of electric current, and therefore, will not produce sufficient heat required at a given current level
Explanation:
