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Q. While two identical ions are separated by a distance of 6.5 x10-10 m, the electrostatic force each exerts on the other is 2.2 x10-9 N. How numerous electrons are missing from each ion?
Q. What is the lift (in newtons) because of Bernoulli's principle on a wing of area 78m^2 if the air passes over the top and bottom surfaces at speeds of 260m/s and 150 m/s, respectively?
A chocolate bar (40grams) has 210 Calories. Approximately how long would the 100 watt light bulb shine if we convert all the chocolate's energy into electricity (100% efficiently)? (Remember 1Cal = 1000 cal = 4200 joules)
A person holds a ladder horizontally at its center. Treating ladder as a uniform rod of length 3.30 m and mass 7.43 kg, find out the torque the person must exert on the ladder to give it an angular acceleration of 0.405 rad/s2.
A gymnast of mass 56.0 {rm kg} hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. Use the value 9.81 {rm m/s^2} for the acceleration of gravity.
Two boats start together and race across a 64-km-wide lake and back. Boat A goes across at 64 km/h and returns at 64 km/h. Boat B goes across at 32 km/h, and its crew, realizing how far behind it is getting, returns at 96 km/h. Turnaround times ar..
In each cycle of its operation, a refrigerator removes 10 J of heat from the inside of the refrigerator and releases 38 J of heat into the room. How much work per cycle is needed to operate this refrigerator.
Standing at a crosswalk, you hear a frequency of 520 Hz from the siren of an approaching police car. After the police car passes, observed frequency of the siren is 455 Hz. Establish the car's speeds from these observations.
A butterfly at eye level is 26 cm in front of a plane mirror. You are behind the butterfly, 48 cm from the mirror. What is the distance between your eye and the image of butterfly in the mirror.
Find out how fast a GPS satellite is moving relative to someone on the ground and from that how much slower time runs where it is in orbit relative to someone on the ground.
A pie plate is filled up to the brim with pumpkin pie filling. The pie plate is made of Pyrex and its expansion can be neglected. It is the cylinder with an inside depth of 2.10 cm and an inside diameter of 30 cm.
What are ranges of wavelength and frequency
find the angular speed after the grindstone. what must be its minimum mass so that material on its surface remains in place during the rapid rotation.
Co-60 is often used as a radiation source in medicine. It has a half-life of 5.25 years. How long, after a new sample is delivered, would the activity have decreased to about 1/3 its original value.
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