13. Numerical problems A crowbar of length 1m is pivoted at 20 cm away from the load of 400 N. Calculate (i) Effort applied (ii) MA (iii) VR (iv) Efficiency (v) Show a diagram of the lever. The diameters of the wheel and axle are 0,5 m and 20 cm respectively. Calculate its VR. A pulley system consists of 6 pulleys in order to lift the load of 300 N applying 60 N force. What is its efficiency? 25.​

Which is an example of gaining a static charge by conduction? a) rubbing a balloon against your hair. b) shuffling your shoes across a carpet. c) bringing a charged rod near an electroscope. d) touching your car on a cold day and getting a shock.

Against his financial advisor's advice, frank has decided to invest his money in some risky stocks because he once made quite a bit of money in the stock market. his decision illustrates a. the representativeness heuristic b. overconfidence c. the availability heuristic d. confirmation bias select the best answer from the choices provided

The starship enterprise is caught in a time warp and spock is forced to use the primitive techniques of the 20th century to determine the specific heat capacity of an unknown mineral. the 125-g sample was heated to 96.3°c and placed into a calorimeter containing 85.9 g of water at 20.0°c. the heat capacity of the calorimeter was 14.2 j/k. the final temperature in the calorimeter was 24.5°c. what is the specific heat capacity (in j/g°c) of the mineral? enter to 4 decimal places.