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You have designed a cat door that consists of a square piece of plywood that is 1.0 in thick and 6.0 on a side, and is hinged at its top. To make sure the cat has sufficient time to get through hit safely, the door should have a natural period of at least 1.0s. Will your design work? If not, describe qualitatively what you would need to do to make it meet your requirements.
A parallel-plate capacitor in air has a plate separation of1.37 cm and a plate area of 25.0cm2. The plates are charged to a potential difference of268 V and disconnected from thesource. The capacitor is then immersed in distilled water. Assumethat..
A small steel ball bearing with a mass of 17.0 g is on a short compressed spring. When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.25 m. Calculate the horizontal distance the ball would travel
a woman can read the newspaper if it is held no closer than 57.2 cm from teh eye. what should the focal length of a
the electron in a hydrogen atom with an energy of-.544 ev is in a subshell with 18 states.a what is the principal
A 18.3-kg object hangs in equilibrium at the end of a rope (taken as massless) while a wind pushes the object with a 65.1-N horizontal force. compute the ropes angle from the vertical
At what net rate does heat radiate from a 275m^2 black roof on a night when the roof temp is 30.0C and the surrounding temp is 15C. The emissivity of the roof is 0.900
A piece of iron is heated to 900?C. What is the median wavelength of its blackbody radiation
when light of wavelength 300 nm is incident upon potassium the emitted electrons due to the photoelectric effect have a
A ball attached to a string is twirled in a circle of radius 1.25 m. If the constant speed of the ball is 2.25 m/s, what is the period of the circular motion
The driver of a motorboat that can move at 10 m/s in still waterwishes to travel directly across a narrow strait in which thecurrent flows at 5.0 m/s
a hydrogen atom undergoes a transition from the n 12 state to the n 5 state. during this transition does the atom
A 250 ohm resistor is connected in series with a 4.80 uF capacitor. The voltage across the capacitor is v_{C}=(7.60 V)sin [(120 rad/s}) t ]. Determine the capacitive reactance of the capacitor.
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