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From ear level down the wishing well, a coin is dropped by Liza. The coin falls a distance of 7.00 m before it strikes the water. If the speed of sound is 343 m/s, how long after Liza releases the coin will she hear a splash?
A car is speeding up and has an instantaneous velocity of 1.0 m/s in the +x-direction when a stopwatch reads 10.0 s. It has a constant acceleration of 2.0 m/s2 in the x-direction.
(a) What change in speed occurs between t = 10.0 s and t = 12.0 s?
(b) What is the speed when the stopwatch reads 12.0 s?
Suppose a golf ball is hit off with the tee with an initial velocity of 30 m/s at an angle of 35° to the horizontal.
What is the maximum height reached by the ball?
What is its range?
1. An object weighs 300 N on Earth and 50 N on the Moon. Does the object also have less inertia on the Moon?
2. Consider a child holding a helium balloon in a closed car at rest. What would the child observe when the car (a) accelerates from rest and (b) brakes to a stop? (The balloon does not touch the roof of the car.)
Calculate the elictric field felt by a positive test charge located half way between a charge of +1C and charge of -3C, that are 2m apart.
A watt is a unit of energy per unit time, and one watt (W) is equal to one joule per second (Jasa 1) A 60.0 W incandescent lightbulb produces about 5.00% of its energy as has an average wavelength of 5100 nm. calculate how many such photons are emitted per second by a 60.0W incandescent lightbulb.
A rubber ball is tied to a 3-meter string and revolves around an erect pole at a velocity of 7.5 m/s every five (5) seconds. What is the ball’s angular acceleration in radians per square second?
A capacitor of capacitance 20 micro-microfarads consists of two parallel plates each moving an area of 200 cm^2, separated in air a distance d apart. This condenser is charged to a difference in potential of 200 V and it is then disconnected from the source. Find (a) the distance of separation d, (b) the charge stored in the condenser, (c) the work done in storing this charge, and (d) the work needed to pull the plates apart to a distance of 3d.
It is known that the mass of the earth is 81 times the mass of the moon.Show that the point of weightless between the earth and the moon for a spacecraft occur at 9/10 of the distance to the moon Hint: Me/b²=Mm/(a-b)²?
A car of mass 8000kg moves in a circular path of 100m with a linear velocity of 50m/s.Calculate the i) Angular velocity ii) Angle the tyre makes with the ground iii) condition for skidding for u(coefficient of friction)= 0.5?
