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Chris jumps off a bridge with a bungee cord (a heavy stretchable cord) tied around his ankle, (Figure 1). He falls for 15 m before the bungee cord begins to stretch. Chris's mass is 80 kg and we assume the cord obeys Hooke's law, F=−kx, with 54 N/m.
b) What is your acceleration at the bottom of the jump?
if the period of a simple pendulum is 2 s, what should its length be ? if the length of the pendulum is doubled what will its period be.
A wire 75m long and 3.38cm in diameter is connected to a source of power with a potential difference of 18.25v and a current flowing of 28.92A. Assume the temperature remains constant. Calculate the resistivity of the metal.
If an electric field strength greater tham3.0*106 N/C is enough to cause conduction between the plates. Find the maximum charge either of the plates can hold without conduction.
The ratio of number of electronic states in the energy range 2-3 eV to that of in 0-3 eV ((Number of electronic states in the energy range 2 -3 eV)/(Number of electronic states in the energy range 0-3 eV)) will be
A plane which is flying horizontally at a constant speed Vo and at a height h above the sea must drop a bundle of supplies to a castaway on a small raft. Write down newtons second law for the bundle as it falls from the plane, assuming you can neglect air resistance.
A projectile is fired at an angle of 30° above the horizontal from the edge of a vertical cliff. Ignore
air resistance. (a) Is the projectile’s velocity ever only horizontal? If so, when; if not, why not?
(b) Is its velocity ever only vertical? If so, when; if not, why not? (c) Are there any points at which
the projectile’s acceleration is either parallel or perpendicular to its velocity? Explain.
if the change in resistance of copper wire on stretching is 4%, then its length is stretched by
What is the magnitude of the electric force between two electrons
separated by a distance of 0.10 nm? (1 nm = 1 x 10 -9 m)
Two charges, a= +6uC and qz=-5uC.
are separated by a distance r = 15cm.
What is the magnitude of the electric
force? Is the force repulsive or attractive?
