Physics Properties Of Matter Level: Misc Level
What is the net upward force on an airplane wing of 20 m2 if the speed of flow is 300 m/s across the top of the wing and 280 m/s across the bottom? net upward force=
Physics Properties Of Matter Level: Misc Level
A steel safe of weight 1.00 x 10 4 N. is being raised to the top of a building. The steel cable to be used was only 15 m long and so an additional 7 m length of another cable had to be used. If both cables have a diameter of 1.00 cm, and the total stretch of both cables put together is 2.35 cm, what is the Young,s modulus of the second cable?The weight of both cables is negligible compared to that of the safe.
Physics Properties Of Matter Level: Misc Level
The density of ice is 920 kg/cm3, and that of seawater is 1030 kg/m3. What fraction of the total volume of an iceberg is exposed?
Exposed fraction of the total volume of an iceberg=
Physics Properties Of Matter Level: Misc Level
A large stone is resting on the bottom of the swimming pool. The normal force of the bottom of the pool on the stone
a. is equal to the weight of the stone
b. is equal to the weight of the water displaced
c. is equal to the sum of the weight of the stone and the weight of the displaced water
d. is equal to difference between the weight of the stone and the weight of the displaced water
Physics Force & Laws Of Motion Level: Misc Level
Suppose that a girl weighing 125 pounds is wearing spike" heel shoes. If the surface of the heel in contact with the floor corresponds to a square measuring 1/4 on each side, and if she stands momentarily with all her weight on one heel, what is the pressure she exerts on the floor?
a.125 Ibs/in2
b. 500 Ibs/in2
c. 1000 Ibs/in2
d.1250 Ibs/in2
e. 2000 Ibs /in2
Physics Properties Of Matter Level: Misc Level
A glass container is half-filled with mercury, and a steel ball is floating on the mercury.If water is then poured on top of the steel ball and mercury, filling glass, what will happen to the steel ball?
a. If will float higher in the mercury
b. If will float at the same height.
c.It will float lower in the mercury.
d.It will sink to the bottom of the mercury.
Physics Force & Laws Of Motion Level: Misc Level
When a force is applied to a certain rod, there is a 1 cm change in length. If that same force is applied to a rod that is three times bigger in each dimension, what will be the change in length?
a. 9 cm
b. 3 cm
c.1 cm
d.0.33 cm
e.0667 cm
Physics Ray Optics Level: Misc Level
Why do aging people have vision difficulties?
Physics Gravitation Level: Misc Level
Gold has a density of 19.3 x 10^3 kg /m^3. What would be the radius of a solid gold sphere if the acceleration due to gravity at its surface is to be 9.81 m/s^2? Remember, G=6.67x 10^-11 N-m^2 /kg ^2 and V=4/3 (pi)r^3.
Physics Rotational Mechanics Level: Misc Level
While whirling around in a vertical circle with a radius of 1.50 meters, a 2.00 kg mass is held on a rope attached to a very light spring scale. What value does the scale read when the mass is moving at 4.00 m/s at the lowest point in its orbit?
Physics Work,Power & Energy Level: Misc Level
The express elevator in the Sears Tower in Chicago averages a speed of 9.1 m/s in its climb to the 103 rd floor, 410 meters above the ground. Assuming a load of 1.0 x10^3 kg, what average power must the lifting motor supply?
Physics Work,Power & Energy Level: Misc Level
An athlete whose mass is 55.0 kg steps off a 10.0 meter platform and drops onto a trampoline which, while stretching, brings her to a stop 1.00 meter above the ground. Assuming no losses, how much energy must have momentarily been stored in the trampoline as she came to rest?How high should she bounce on the rebound?
Physics Work,Power & Energy Level: Misc Level
A 200g mass attached to the end of a spring causes it to stretch 5 cm. If another 200g mass is added to the spring, the potential energy of the spring will be:the same, 3 time as much, twice as much,4 times as much.
Physics Measurements Level: Misc Level
6.0 X 10 to the first power is approximately -27 m/s,27 km/h, 96 m/s, 29 km/h
Physics Measurements Level: Misc Level
A 2 liter bottle of soda gives you more for your money than a 2- qt bottle would, at the same price. True or False.?
