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A ping pong ball (m = 0.0027 kg) is dropped and reaches the floor in 1.30 s. If, during its descent, the ping pong ball experiences an air resistance force of 0.022 N, calculate the displacement it fell. 


The wave length and a set of wave travelling in a medium are 60cm and 320cm² means a plane refraction surface at an angle of 60°.If velocity after is 280cm², calculate the wave length of the wave in the second medium and also the angle of refraction.


The wave length and a set of wave travelling in a medium are 60cm and 320cm² means a plane refraction surface at an angle of 60°.If velocity after is 280cm², calculate the wave length of the wave in the second medium and also the angle of refraction.


An object of mass 3.0 kg travels with a speed of - 3.5 m/s on a frictionless

surface. The object collides with a 4.0 kg object at rest that exerts an average

net force over an interval of time 2.0 ​m​s such that the 3.0 kg object comes to

rest.

A. What is the average force on the 4.0 kg object?

B. What is the final velocity of the 4.0 kg object?



Who forces a locomotive to deviate from the right path when it enters a curve? Pls



Who forces a locomotive to deviate from the right path when it enters a curve? Pls


 A student is investigating whether using a lid reduces the time taken to heat a beaker of water to

boiling point.

The student can use the following apparatus:

thermometer

250 cm3 glass beaker

250 cm3 measuring cylinder heatproof mat

lid to fit the beaker

clamp, boss and stand.

Plan an experiment to investigate whether using a lid reduces the heating time. You are not required to carry out this experiment.

You should

• list the additional apparatus that you would require

• explain briefly how you would carry out the investigation

• state the key variables that you would control

• draw a table with column headings, to show how you would display your readings; you are not required to enter any readings in the table

• explain how you would use your readings to reach a conclusion.

A diagram is not required but you may draw a diagram if it helps your explanation


An object is suspended on a spring balance in a ship sailing

along the equator with a speed v. Show that the scale reading

will be very close to where is the angular

speed of the Earth and W0 is the scale reading when the ship

is at rest. Explain the plus or minus.


a cat, meerkat and rat are fighting over a bat. the cat is pulling with a force of 25N (south), the rat is pulling with a force of 12N (North 20 degrees east) and meerkat is pulling with a force of 18N (N30 degrees west) what is the net force and acceleration acting on the 2.2kg bat


An ox is being made to drag a box of socks. there is 920N of friction between the box and the floor, the box has a mass of 350kg. the ox is pulling with a force of 1200N right. draw a free body diagram showing the forces relevant to the motion of the box and calculate the acceleration.


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