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A tennis ball is thrown upwards with sufficient speed to reach a height of 12 m.
(i) What is the kinetic energy of the tennis ball at a height of 12 m?
(ii) Calculate the speed of the tennis ball when it reaches a height of 6 m.
A stone is thrown horizontally off a 25 m high building. It hits the ground a distance of 20 m from the foot of the building. What is the initial velocity of the stone?
A signal is transmitted from a ship and an echo is received from an object below the ship 4 s later. Calculate the distance of the object from the ship if the speed of sound in water is 1400 m/s.
What is the range of the wavelengths of light that is visible to the human eye?
A 20 kg brick stands upright on the ground as shown. What is the pressure it exerts on the ground?
Specific of brick : Height ( 10cm) Length (20cm) Width (5cm)
A uniform electric field E = 5000 N/C passing through a flat square area A = 2m2. Determine the electric flux. Note: The angle between the electric field direction and a line drawn perpendicular to the area is 60 degree.
two positive point charges q are placed on the y-axis at y=a and y=-a. a negative point charge "-q" is located at some point in the +-axis.
A wire with a resistance of 5Ω is drawn out through a die so that its new length is four times its original length. What is the resistance of the longer wire when the resistivity and density of the material are unchanged?
A human being can be electrocuted if a current as small as 50mA passes near the heart. An electrician with sweaty hands makes good contact with two conductors he is holding, one in each hand. If his resistance is 2kΩ, what is the fatal voltage?
Oil flows through a pipeline which contracts from 450mm diameter at A to 300mm diameter at B and then forks, one branch being 150mm diameter discharging at C and the other branch 225mm diameter discharging at D. if the velocity at A is 1.8 m/s and the velocity at D is 3.6 m/s, what will be the discharges at C & D and the velocity at B & C
