Search
Household Experiment - Cooling a Balloon
Inflate a balloon at room temperature. Leave the inflated balloon in the refrigerator or in an ice bucket half-filled with ice overnight. What happens to the balloon and why? Then illustrate/draw what happens to the balloon before leaving it in the refrigerator overnight and after leaving it overnight.
A soccer goal, found in a city park, is made of tubing that supports an
odd-shade hanging net behind the goal, but has a rectangular opening
in front. The height of the opening is 2.8m and the width is 3.5m.
If a uniform electric field, with magnitude of 0.1N/C, passes through
the goal from the front to the back, entering at 90 degrees to the plane
of the goal opening, what is the flux through the net? Also, find the flux
through the net if the electric field enters the goal at 60 degrees angle
to the plane of the front of the goal. In both cases, assume that there is
no charge found inside the goal itself.
Superman (who we’ll assume to be 2 meters tall) is flying at 0.8c (80% the speed of light). With proper application of physics, how tall will he appear to be to an outside observer?
There is a 50 meter long train. It magically goes at 60% the speed of light (0.6c). How long will it appear to be to an outside observer?
refraction is cause by
How much work is done by 15 kW engine during 3.5 min?
A fish is seen at an apparent depth depth 13m
Find its real depth of the fish if the refractive index of water is 1.33
A wind turbine can generate 150W on average and costs £3000 to buy and install What is the cost per kWh if the owner wants to pay for the turbine with five year's electricity sales? Give your answer as a number of pence to the nearest penny
In an experiment to determine the energy stored in a stretched spring, a spiral spring was suspended from a properly mounted retort stand. A mass hanger was suspended on the free end of the spring and different masses added to the hanger. The hanger was gently pulled backwards and released to set I into vertical oscillations. For each mass, the average time for ten vibrations was taken and presented as shown in the data below.
MASS(g) Averagetimetaken for ten
50.0 5.80
70.0 6.80
90.0 7.80
110.0 8.60
130.0 9.20
Period,T(s)
T2(*10-3 s)
State the number of significant figures in each of the following numbers and explain your answer
(I) 37.60 (Ii) 0.0130 (III) 13000 (iv) 1.3400
