Search & Filtering
An office worker attempts to move a filing cabinet (m = 48 kg). The coefficient of static friction between the floor and the filing cabinet is 0.53. (4 marks)
a) Calculate the normal force acting on the filing cabinet.
b) Calculate the minimum horizontal force that the office worker must apply to the filing
cabinet to JUST move it.
Calculate the apparent weight of an elevator attendant (m = 84 kg) if the elevator is accelerating downward at 2.80 m/s2.
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.
A concave mirror has a focus of 75cm. An object is placed 60cm in front of the mirror. Describe the image characteristics of this object
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 ms 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
