Questions Asked on
July 12, 2020

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 
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 
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 
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 
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 
mathematics
am a number between 20 & 30. You can divide me into 6 equal groups. What number am I?
asked by karina 
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 
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 
Physics
A 3kg toy car with a speed of 6 m/s collides headon with a 2kg 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 
English
According to Standard 621989: 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 
English
is hard working an adjective?
asked by gigi 
Mathmatics
Find the perimeter of a paralle logram whose base is 6cm and side 5cm
asked by Florence 
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 
English
English is a language of opportunities .why should bother to learn indigenous
asked by zandile 
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 
Math
From 45ft to 92ft percentage change
asked by Palwasha 
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 
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 
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