susane

Most popular questions and responses by susane
  1. Physics

    Thanks for any help :) Four 20 ohm resistors are connected in parallel and the combination is connected to a 20V emf device. The current is: A) 0.25A B) 1.0 A C) 4.0 A D) 5.0 A E) 100 E Parallel circuits: I know that the voltage is 20V and the Resistance

    asked on March 15, 2007
  2. Physics

    If 500 J of work are required to carry a charged particle between two points with a potential difference of 40V, the magnitude of the charge on the particle is: a) 0.040 C b) 12.5 C c) 20C D) cannot be computed unless the path is give e) none of these My

    asked on March 12, 2007
  3. physics (please check)

    A total resistance of 3 ohms is to be producd by combining an unknown resistor R with a 12 ohm resistor. What is the value of R and how is it connected to the 12 ohm resistor a) 4.0 ohm parallel b) 4.0 ohm in series c) 2.4 ohm in parallel d) 2.4 in series

    asked on March 28, 2007
  4. physics

    A 1-kg block is lifted vertically 1m by a boy. The work done by the boy would be one jule or would no work be done. I'm confused, I thought lifting wasn't considered work. The work done is actually about 9.81 joules. Think of gravity pulling on the block

    asked on November 6, 2006
  5. Standing waves and resonance (physics)

    A nylon string has a linear density of 7.2g/m and is under a tension of 150N. The fixed supports are 90cm apart. The string is oscillating in the standing wave pattern. Find a)speed b)wavelength c) frequency v=sqr(F/u(linear density) v=sqrt(150N/7.2g/m) =

    asked on February 6, 2007
  6. Physics (please check)

    A 6.0kg block is released from rest 80m above the ground. When it has fallen 60m its kinetic energy is: I got 1200J as my answer mgh=(6.0*9.81* 60m)=3531.6 PE + KE= (ME + KE) 3531.6 + KE= (6.0*9.81*80m) KE= 1177.2 is that right A 6.0 Kg block is thrown up

    asked on November 5, 2006
  7. physics (please check work)

    Four identical particles, each with mass m, are arranged in the x,y plane like a cross. They are connected by light sticks to form a rigid body. If m=2.0kg and a=1.0 m the rotational inertia of this array about the y axis is: work: I know that I= mr^2

    asked on December 9, 2006
  8. physics

    If a wheel turns with a costant rotational speed then: each point on its rim moves with constant roational velocity, each point on its rim moves with constant translational acceleration, the wheel turns with constant translation acceleration, the wheel

    asked on December 9, 2006
  9. Physics (please help)

    A sinusoidal wave travels along a string. The time for a particle to move from maximum displacement to zero is 0.170s. What are the a)period b)frequency c) the wavelength is 1.40m what is the wave speed? ok I know i need the equation T=1/f and the wave

    asked on February 4, 2007
  10. physics (please help)

    Four 20 ohm resistors are connected in parallel and the combination is connected to a 20 V emf device. The current in any one of the resistors is: A) 0.25 A B) 1.0 A C) 4.0 A D) 5.0 A E) 100 A I get B V=IR I= 20V/20 ohms = 1 A for any one of the resistors

    asked on March 28, 2007
  11. physics

    During a lighting discharge, 30C of charge move through a potential difference of 1.0 X 10^8V in 2.0X10^-2s. The energy released by this lighting bolt is: a)1.5 X 10^11 J b) 3.0 X 10^9 J c) 6.0 X 10^7 J d) 3.3 X 10^6 J e) 1500 J Ok I am not really sure

    asked on March 12, 2007
  12. physics (please check)

    Four 20-ohm resistors are connected in series and the combination is connected to a 20 V emf device. The current in any one of the resistors is: A) .25 A B) 1.0 A c) 4.0 A D) 5.0 A E) 100 A My answer: A R= 20 + 20 + 20 + 20 =80 V= IR 20/80=I I=.25 A

    asked on March 28, 2007
  13. physics question

    The sum of the emfs and potential difference around a closed loop equals zero" is a consequence of: a) Newton's third law b) Ohm's law c) Newton's second law d) conservation of energy e) conservation of charge For this question: I had picked d conservation

    asked on March 28, 2007
  14. please check

    If a wheel turns with a costant rotational speed then: each point on its rim moves with constant roational velocity, each point on its rim moves with constant translational acceleration, the wheel turns with constant translation acceleration, the wheel

    asked on December 9, 2006
  15. physics

    For any circuit the number of independent equations containing emfs, resistances, and currents equals the number of branches. why? The only type of circuit that branches is parallel. But there can be electric circuit with a combination of both parallel and

    asked on March 15, 2007
  16. physics (thanks)

    in the context of the loop and junctions rules for electrical circuits a junction is: a) where a wire is connected to a resistor b) where a wire is connected to a battery c) where only two wire are joined d) where three or more wire are joined e) where a

    asked on March 27, 2007
  17. please check (physics)

    Current flows out of a 110V source through a 10 ohm resistor and then through parallel branches, one containing a 20 ohm resistor and the other a 30 ohm resistor. Find V I R P V I R P 50 5 10 250 60 3 20 180 60 2 30 120 _____________________________ 110 5

    asked on March 28, 2007
  18. physics

    The emf of a battery is equal to its terminal potential difference: A) under all conditions B) only when the battery is being charged C) only when a large current is in the battery D) only when there is no curent in the battery E) under no conditions my

    asked on March 27, 2007
  19. waves (physics)

    Two sinussoidal waves identical except for phase travel in the same direction along a string and interfere to produce a resultant wave given by y(x,t)= (3.0mm) sin(20 rad/m)x - 4.0rad/s t + 0.820 rad) with x in meters and t in seconds. What is a) the

    asked on February 6, 2007
  20. physics (check my work pleas)

    A 5.00kg ball is swung at the end of a 1.25 m chain with a w of 2.0s^-1. Find the balls a)V (m/s) b) KE 1/2mv^2 c) I, inertia d) Ke with I e) Fc--> centripetal force Work a) v=rw v= (1.25m)(2.0s^-1) v= 2.5 m/s b) 1/2 mv^2 (.5)(5)(2.5)^2 c) I=mr^2 =

    asked on December 11, 2006