Questions Asked on
July 12, 2020

  1. Physics

    A block and tackle system consisting of 5 pulleys is used to raise a load of 400 N through a height of 10 m. If the work done against friction is 100 j, calculate

    asked by fred
  2. physics

    A point charge of –3.00 μC is located at the origin; a point charge of 4.00 μC is located on the x axis at x = 0.200 m; a third point charge Q is located on the x axis at x = 0.320 m. The electric force on the 4.00 μC charge is 240 N in the +x

    asked by Jasmine
  3. science

    In a simple machine the energy input is 120J. If the efficiency of the machine is 80%, calculate the energy output of the machine.

    asked by Derrick
  4. Calculus

    Find the maximum and minimum values of the function f(x,y)=4x^2 +9y^2 subject to xy = 4. Use Lagrange multipliers.

    asked by Anonymous
  5. Physics

    I need help on this question: Light bulbs are often assumed to obey Ohm's law. However, this is not really true because their resistance increases substantially as the filament heats up in its "working" state. A typical flashlight bulb at full brilliance

    asked by Jimmy
  6. mathematics

    am a number between 20 & 30. You can divide me into 6 equal groups. What number am I?

    asked by karina
  7. Physics

    A 1.0 μF capacitor is being charged by a 6.0 V battery through a 10 MΩ resistor. I need help solving these parts: A) Determine the potential across the capacitor at time t=1.0s. Express your answer in volts. B) Determine the potential across the

    asked by Jimmy
  8. Physics

    A 6.30 μF capacitor that is initially uncharged is connected in series with a 4300 Ω resistor and a 501 V emf source with negligible internal resistance. I need help on these two questions: 1) A long time after the circuit is completed (after many time

    asked by Jimmy
  9. Physics

    A 3-kg toy car with a speed of 6 m/s collides head-on with a 2-kg car traveling in the opposite direction with a speed of 4 m/s. If the cars are locked together after the collision with a speed of 2 m/s, how much kinetic energy is lost? (in units of

    asked by Samy
  10. English

    According to Standard 62-1989: Ventilation for Acceptable Indoor Quality of the American Society for Heating, Refrigeration, Air Conditioning Engineers, adequate supply of outdoor air should be about 20 cubic feet per minute per occupant.

    asked by rfvv
  11. English

    is hard working an adjective?

    asked by gigi
  12. Mathmatics

    Find the perimeter of a paralle logram whose base is 6cm and side 5cm

    asked by Florence
  13. English

    1. The goal of the charity was to help its target demographic integrate into U.S. society. 2. The goal of the charity was to help its target demographic integrate into the U.S. society. ====================================================== Do we have to

    asked by rfvv
  14. English

    English is a language of opportunities .why should bother to learn indigenous

    asked by zandile
  15. Physics

    If the first (horizontal) resistor had zero resistance, what would be the initial voltage across the capacitor? Express your answer in terms of E. At least I know why the answer I typed into the problem, which was V_C,0 = E, was definitely incorrect,

    asked by J1
  16. Math

    From 45ft to 92ft percentage change

    asked by Palwasha
  17. psychology

    Developmental psychologists study all of the following EXCEPT: -What part of the brain is involved in the development of depression - Smoking trends of adolescents - Prenatal development - Aging issues of the elderly - How personality develops across the

    asked by sam
  18. mathematics

    in the diagram below triangle STR is the enlargement of QPR. if |PQ|=2.4cm |TQ|=8cm and |QR|=4cm find |ST|

    asked by Dwomoh Evans
  19. Calculus

    Find the directional derivative of the function f(x,y,z) =z^2 -xy^2 at the point P(2,1,3) in the direction of the vector v=< -1, 2, 2 >.

    asked by C