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Q. A small immersion heater is rated at 363W. Approximate how long it will take to heat a cup of soup (assume this is 250mL of water) from 20 °C to 50 °C.
Q. A rectangular barge, 5 m long and 2 m wide, floats in fresh water. How much deeper would it go if there were a 500kg horse on it?
Two wires are tied to the 500 sphere. The sphere revolves in a horiIzontal circle at a constant speed of 6.8.
An apple drops from the tree and falls freely. The apple is originally at rest a height {H0} above the top of the grass of a thick lawn, which is made of blades of grass of height {h}. When apple enters the grass, it slows down at a constant rate ..
Two identical positive charges exert a repulsive force of 7.4 x10-9 N when separated by a distance of 4.8 10-10 m. compute the charge of each.
What is the reading of spring scale
David is driving a steady 28.0m/s while he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.70 at the instant when David passes. How far does Tina drive before passing David.
When it rains water vapour in the air condenses into liquid water and energy is released. How much energy is released when 0.0244m of rain falls over an area of 2.59 x 10^6 m^2? If the average energy needed to heat one home for a year is 1.40 x 10^11..
Two boats start together and race across a 46 km wide lake and back. Boat A goes across at 44 km/h and returns at 48 km/h. Boat B goes across at 27 km/h, and its crew, realizing how far behind it is getting, returns at 69 km/h. Turnaround times are n..
How various g's of acceleration does the astronaut experience when the device is rotating at top speed? Each 9.80 m/s^2 of acceleration is 1 g.
A particular organ pipe can resonate at 231 Hz, 385 Hz, and 539 Hz, but not at any other frequencies in between. Is it an open or a closed pipe? What is the fundamental frequency of this pipe.
Suppose a patient having an MRI is immersed in a 3.0 T field along the axis of his body. He then quickly tips his head to the side, toward his right shoulder, tipping his head by 30 degrees in the rather short time of 0.15 s.
A Histogram shows that the mean of rain in the area has increased over the last 5 years. What is the probability that the mean would be higher this year than in the previous 5.
A potter's wheel having a radius 0.55m and a moment of inertia 12kg•m2 is rotating freely at 51 rev/min. The potter can stop the wheel in 7 s by pressing a wet rag against the rim and exerting a radially inward force of 67N. Find out the effectual co..
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