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A stone is thrown horizontally at 20 m/s from the top of a cliff 63 m high. How fast is it moving the instant before it hits the ground?
A crate weighing 490 N is pushed along a surface. If it takes 126 N to get the crate starts to move (a = 0), what is its static friction and coefficient of static friction μs? Solve the unknown and confirm your answer of static friction using the Phet Simulation software. (Use the part of with Acceleration in Phet Simulation)
The car screw Jack is used to lift a car whose weight is 8800N.The bar for rotating the jack is 0.21m long and pitch of the screw is 2 mm. Calculate the effort required to operate the screw Jack assuming 50% efficient. If the bar is rotated 10 times how far will the car be raised? Hence, calculate the work done in raising the car through this distance.
A dielectric object is placed in an electric field. The object becomes polarised and
a large number of atomic/molecular dipoles in the object align in the direction of
the applied electric field. Derive an expression for the electric potential due to this
polarised dielectric at a point outside the dielectric.
A transformer steps down 220V Ac to 12V AC. Using suitable circuitsincorporating PN diodes
i.Half wave rectified signal [10]
explain how each of the following signals can be obtained
ii.Full Wave Bridge rectified signal.
A metal bar 50cm long at 15°c is heated to 85°c. If it expands by 0.088cm, determine its linear expansivity.
A galvanometer with a resistance of 15.0Ω gives a full-scale reading for current of 3.0 A. What shunt resistance is needed to convert this into an ammeter with a 30.Ω A full-scale reading?
If a school bus moves 1600 meters at an average speed of 12 m/s, how long did the journey take?
Explain symmetric and antisymmetric function using three identical particles
When a glass is rubbed with a silk cloth, the rod acquires a charge of magnitude 3.45 nC. (a) Did the glass rod gain or lose electrons/ (b) How many electrons were transferred during the process? (c) What is the change in the mass of the glass rod? (d) What is the change in the mass of the silk cloth?
