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Physics
An electrician wishes to cut a copper wire (ρ=1.724 X10−8Ωm) that has no more than 10Ω of resistance. The wire has a radius of 0.725mm.
1. The area of cross section of the wire is in square mm
Physics
E2—Spring Catapult launches Angry bird
An angry bird, with a mass of 5.00 kg, is launching itself using a catapult, for unknown reasons. Presumably it is angry because it cannot fly, and in fact air resistance is zero (which makes flying impossible, for complicated reasons). Treat the catapult as a spring with force constant k= 500 N/m. The initial time is when the catapult is at maximum stretch with the bird at rest. The final time has the bird at maximum height, moving horizontally.
a) Draw the energy bar chart for the system. Be sure to describe what objects are included in the system. [4 marks]
b) The catapult is drawn back 2.00 m. Find the spring energy stored in the catapult. [2 marks]
c) Find the launch velocity of the angry bird (assume ∆h=0 during the launch). [2 marks]
d) The bird rises to a maximum height of 10 m. Find the final velocity of the bird. [4 marks]
e) Use your answers to parts c) and d) to determine the launch angle. [3 marks]
An angry bird, with a mass of 5.00 kg, is launching itself using a catapult, for unknown reasons. Presumably it is angry because it cannot fly, and in fact air resistance is zero (which makes flying impossible, for complicated reasons). Treat the catapult as a spring with force constant k= 500 N/m. The initial time is when the catapult is at maximum stretch with the bird at rest. The final time has the bird at maximum height, moving horizontally.
a) Draw the energy bar chart for the system. Be sure to describe what objects are included in the system. [4 marks]
b) The catapult is drawn back 2.00 m. Find the spring energy stored in the catapult. [2 marks]
c) Find the launch velocity of the angry bird (assume ∆h=0 during the launch). [2 marks]
d) The bird rises to a maximum height of 10 m. Find the final velocity of the bird. [4 marks]
e) Use your answers to parts c) and d) to determine the launch angle. [3 marks]
Wavelength at which the spectral radiancy of sun is maximum 500 nm. calculate the temperature of Sun ?
a horizontal venturimeter with inlet diameter 30 cm and throat diameter 15cm is used to measure the flow of oil of specific gravity 0.8. The discharge of oil through venturimeter is 50 litres/s. Take C=0.98. write the reading of the oil-mercury differential manometer (x)
Physics
What is the weight of the earth of a running basketball players with mass of 100 kg
Physics
An archer uses her bow to shoot a 100g arrow. She pulls the bow back 58.7cm with a force of 250N. How fast will the arrow be travelling when it first leaves the bow?
1. A child starts sledding from rest, going down a 40 m long 7.5° incline, then coasting across a horizontal stretch. The mass of the sled + child is 35 kg, and the coefficient of kinetic friction is 0.060.
What is the phase of the Moon if it rises at 4:00 A.M.?
Physics
The stone is thrown straight up from a height of 1.2 m at an initial speed of 11 m/ s. At what height and at what speed does the stone move 1.5 s after the moment of throwing?
Physics
Two 2.5 kg bowling balls are 0.50 m apart. What is the force of gravity of the first bowling ball due to the
second? Compare this to the force of gravity on the second bowling ball due to the first.
second? Compare this to the force of gravity on the second bowling ball due to the first.
