a current of 3 amps flows through a lamp which is connected to a 24 volt battery calculate the lamps resistance
1 answer:
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Answer:
v = 28.7 m/s
Explanation:
- According to the Work Energy Theorem, the work done by external forces on the system, is equal to the change in the kinetic energy of the system.
- In absence of friction, the only force that does work , producing a displacement in the direction of the force, is the component of gravity parallel to the slide:
- The displacement d,along the slide, can be found from the definition of the sine of an angle, as follows:
- Solving for d, we get:
- Now, the work done by Fgp, is just the product of the force times the displacement, as follows:
- From (1) and (2) we can find W as follows:
- This expression must be equal to ΔK, as follows:
- Simplifying common terms, we can solve for v (the velocity of the sled at the bottom of the slide), as follows:
- The velocity of the sled at the bottom of the slide is 28.7 m/s, taking as positive the direction down the slide.
Answer:
a. Time=25seconds
b.distance=1041.67m
Explanation:
a.The equation for in terms of m/s is
after conversion.
To find when speed reaches 300km/hr=83.33m/s, we find and solve for
b. From a, above we already have our t=25seconds as the time it takes before the plane is airborne.
#To find distance travelled in that time , we substitute for in our distance equation:
Hence the distance of the plane before it gets airborne is 1041.67m