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Find the cost of ising a 3kW immersion heater and five 60 W electric bulbs for a day if the price per unit (kWh) is sh. 4.50
light of wavelength 659.9 nm is emitted by a star. the wavelength of this light as measured on earth is 660.9 nm. how
when a potential difference of 7.35 volts is applied to a certain ohmic resistor the current in the resistor is 0.919
Only a small part of an iceberg protrudes above the water, while the bulk lies below the surface. The density of ice is907 kg/m3 and that of seawater is 1029 kg/m3.Discover the percentage of the iceberg's volume that lies below the surface.
a car moving with constant acceleration covered the distance between two points 60 m apart in 6 s. its speed as it
the astronaut whose heart rate on earth is 65 per minute increase his velocity to v=.95c. what is now his heart rate as measured by an earth observer
A computer to be used in a satellite must be able to withstand accelerations of up to 27 times the acceleration due to gravity. What is the minimum amplitude of vibration
Water ( ρw = 1000 kg/m3 ) flows during a horizontal, cylindrical pipe of radius 0.0200 m. The pipe bends upwards and climbs 5.0 m in height. It then bends horizontal again however widens to a radius of 0.0300 m. What volume flow rate will keep the pr..
In carbon-nitrogen nuclear fusion cycle, protons are fused to form a helium nucleus. Positrons releases some energy. The number of protons fused and the number of positrons released in this process respectively are
You need to use a 21-cm-focal-length lens to produce an inverted image one third the height of an object. At what distance from the object should the lens be placed? Express your answer to two significant figures and include the appropriate units.
If the seat of the chair is 30 cm offthe floor, how far does the Earth move while you are falling
Assume the mass density of Earth from the center to r= R_cm (radius of the core mantle boundary) is d_cm and from R_cm until the surface r=R_e the density is d_e. Using these densities, determine the gravitational potential energy of the Earth
At time t=0 a grinding wheel has an angular velocity of 25.0rad/s . It has a constant angular acceleration of 35.0rad/s^2 until a circuit breaker trips at time t = 2.00s. What was the wheel's angular acceleration as it slowed down
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