When wearing rubber gloving, why does keeping away from a second point of contact reduce the...
A nearsighted student wears contact lenses to correct for a far point that is 4.50m from her eyes. When she is not wearing her contact lenses, her near point is 24cm What is her near point when she is wearing her contacts? Express your answer using two significant figures.
A rubber ball is shot straight up from the ground with speed v0. Simultaneously, a second rubber ball at height h directly above the first ball is dropped from rest. Part A. At what height above the ground do the balls collide? Your answer will be a symbolic expression in terms of v0, h, and g . Part B. What is the maximum value of h for which a collision occurs before the first ball falls back to the ground?...
A-How does the electric field vary as one moves away from a point charge? –the outside of a spherical distribution of charge? -- the inside hollow space of a spherical distribution of charge? –a line of charge? -- far away from a dipole along the perpendicular bisector? -- an infinite sheet of charge? -- inside a capacitor? B-Describe electric field lines from a sphere? –from a flat surface? -- from a pointed object? C- What is the geometric relationship between...
A point charge -1.2 μC is 0.40 m away from a second point charge +1.0 μC . The force on a third charge, +1.5 μC , placed exactly halfway between the other two is a) 2.97 N , directed toward the negative charge b) 0.19 N , directed toward the positive charge. c) 0.74 N , directed toward the negative charge. d) 0.19 N , directed toward the negative charge.
where does hot rising air get its heat from? Why does air get colder as it ascends, if it is getting closer to the sun? If this is because air is moving away from the earth (a possible source of heat) why is it that snow can be on the ground when ambient temperature is above freezing point? Water is a better conductor of heat than air is
A small balloon is released at a point 60 feet away from an observer, who is on level ground. If the balloon goes straight up at a rate of 10 feet per second, how fast (in feet per second) is the distance from the observer to the balloon increasing when the balloon is 80 feet high? 10 a
by expiremnt when we drop aluminum pin and magnatic pin from the same point. why does the aluminum reaches the ground faster than imagnatic? (hint: it has to do with the net force) Why when we drop A into the tube it goes fast while if we drop B it takes much more time "Explain it"
Consider a clock, which when at rest produces a flash of light every second, moving away from you at (4/5)c. (a) How frequently does it flash when it is moving at (4/5)c? (b) By how much does dis- tance between you and the clock increase between flashes? c) How much longer does it take each flash to get to your eye than the previous one? (d) What, therefore, is the in- terval between the flashes vou see? You will find...
11. A rubber ball is dropped from an initial height h=2m. After each bounce the ball returns to 75% of its previous height. What percent of its maximum potential energy, maximum kinetic energy and maximum speed is lost as the result of the first bounce? 12. A 20 kg rock slides across a rough horizontal surface and eventually stops. Initial velocity of the rock is 10m/s, coefficient of kinetic friction is 0.1. What average thermal power is produced as the...
In a titration, why does it generally require less titrant to reach the first equivalence point from the beginning, compared to reaching the second equivalence point from the first equivalence point? Explain the underlying mechanism why.