Physics Homework Aid
Physics holds significant importance among the natural sciences, elucidating life's wonders and ranking among the most challenging subjects to master.
QuestionAI is a rich and user-friendly physics problem solver for novice physicists, enabling exploration of atomic properties and interactions, alongside molecular trajectories under various forces. Furthermore, you can delve into the mysteries concealed amidst galaxies with fellow physics enthusiasts. Boldly pose your conjectures and queries to the AI, and authoritative answers will readily emerge.
- A student wants to find out the current flowing through a lamp. Which circuit should the student use? A A B C D Any of these circuits
- Describe an experiment to find out how the acceleration of an object depends on its mass Your description should include a diagram, procedure, calculations, conclusion and a precaution. b) Define the following giving one example of each. i) contact force i) contact force c) A truck pulls on a log of wood with a force of 4000 mathrm(~N) . If the rope makes an angle of 30^circ with the i) Calculate the horizontal and the vertical components of the force ii) State the function of each component of the force iii) Given that the coefficient of friction between the log and the ground is 0.6 , determine the frictional force on the log. OR (7 mathrm(~d)) , (e.d) and (f) d) i) Define heat and state its SI unit ii) Describe an experiment to measure the specific heat capacity of a liquid. Your description should include a diagram, procedure, calculations, conclusion and a precaution. iii) A 3 mathrm(~kW) heater was used to heat 6 mathrm(~kg) of water for 10 minutes, calculate the change in its temperature (mathrm(c)=4200 mathrm(~J) / mathrm(kgKg)) e) i) What is the instrument used in the hospital to measure the temperature of a patient? ii) State the normal body temperature in kelvin iii) A column of mercury has a length of 10 mathrm(~cm) at ice point and 30 mathrm(~cm) at steam point, if the column of mercury is 14 mathrm(~cm) long at a certain temperature mathrm(T) , calculate mathrm(T) f) Briefly explain why i) A burn from steam is more severe than a bum from an equal mass of boiling water ii) When perfume is sprayed on your hand, it evaporates and your hand feels cooler (2 mark: (2 mark: (2 marks Answer EITER 8 (a), (b) and (c) a) What is a machine? b) A system of five pulleys is used to raise a load of 1200 mathrm(~N) up a building by applying an effort of 320 mathrm(~N) i) Define mechanical advantage ii) Calculate the mechanical advantage of the system iii) What is the efficiency of the system? iv) Determine the length of the rope, which must be pulled in order to raise the load through a vertical height of 1.5 mathrm(~m) . (3 marks) (2 marks) (3 marks) (3 marks) (3 marks) (3 marks) (3 marks) (3 marks) (3 marks) (3 marks) In an experiment to investigate the elastic properties of a material, the length (1) of the material was found to vary with the load used to stretch it as shown in the table eciow. }(l) ( Looding ) ( Item ) & 0 & 5 & 10 & 15 & 20 & 25 & 30 & 35 extension & 10 & 114 & 13.0 & 14.5 & 16.1 & 17.6 & 19.0 & 20.5 i) Copy and complete the table against extension (X-axis) ii) Plot a graph of lead ( mathrm(X) -axis) above i) What conclusion can be drawn from the graph? (2marks) (5marks) (5marks) (1 mark) OR 8 (d), (e) and (f) (i) (2marks) (5marks) (1 mark)
- Question 27 of 30 55 N of force is being applied to a surface, creating 110 Pa of pressure. What is the area of the surface in metres squared? Enter your answer as a number me
- Q8. A trampoline is made from a sheet of material held in place by stretched springs. The figure below shows a child on a trampoline. a) Position A shows the child's maximum height above the trampoline. Position B shows the lowest position reached by the child when landing on the trampoline. Describe the changes to the stores of energy of the: child springs surroundings as the child moves from position A to position B. __ Child __ __
- 19. A kangaroo can vertically jump over an object 2.5m high. A. What is its initial vertical speed to reach this height? B. How long will it stay in the air if it is jump- ing on a level ground? 20.Calculate the magnitude of the acceleration of a particle moving in a circle of radius r=0.5 m with a constant speed of 10m/s 21. A 0.525 kg ball is attached to a 1.25 m string and swings in a circular path making 2.00 revolutions per second. The angle of the string is nearly horizontal. Find the tension in the string. 22. A 0.525 kg ball is attached to a 1.25 m string and swings in a circular path . The angle of the string away from vertical is 30.0^circ Find the centripetal force acting on the ball and the speed of the ball.