Tema
Q:
1. Un nadador recorre una piscina de largo "L"
en 6 s pero si la distancia se duplicara y la
rapidez del nadador se triplicara, determine el
tiempo utilizado en este caso.
\( \begin{array}{lll}\text { a) } 6 s & \text { b) } 8 & \text { c) } 2 \\ \text { d) } 4 & \text { e) } 12 & \end{array} \)
Q:
(i)
The distance \( d \) travelled by a ball is proportional to the square
the time taken, \( t \). After 4 seconds the ball has travelled 40 n
(i) Find a formula linking \( d \) and \( t \).
(ii) Find the distance travelled after 7 seconds.
Q:
Zwei \( 7 \mu \mathrm{~F} \) Kondensatoren sind parallel an \( 135 \mathrm{~V} / 200 \mathrm{~Hz} \) angeschlossen.
a) Wie gross sind die Teilstromwerte?
b) Wie gross muss ein Wirkwiderstand sein, wenn durch dessen Parallelschaltung der Pha-
senverschiebungswinkel noch \( 45^{\circ} \) beträgt?
c) Wie gross wird der Phasenverschiebungswinkel bei Ausfall eines Kondensators?
Q:
A \( 5 \Omega \) resistor and a variable resistor of resistance \( R \) are placed in parallel. The expression for the resulting resist
given by \( R_{T}=\frac{5 R}{5+R} \). Determine the limiting value of \( R_{T} \) as \( R \rightarrow \infty \).
The limiting value of \( R_{T} \) is
(Simplify your answer.)
Q:
Acceleration depends on which two factors?
A) mass and position
B) net force and mass
C) mass and velocity
D) position and net force
Q:
5) When two forces act in the same direction on an object, the net force is found by
the forces.
Q:
4) According to Newton's second law of motion, a larger force acting on an object causes a
greater
Q:
3) Balanced forces acting on an object cause the object to accelerate.
True
False
Q:
2. A small object is placed 6 cm away from a
converging lens of focal length 10 cm . Find
the
a) nature of the image. [ virtual]
b) position of the image. [ 15 cm from lens
c) magnification of the image. [2.5]
Q:
A convex lens produces an inverted image
magnified four times. If the distance of the
object from the lens is 5 cm , what is the focal
length of the lens? [ 4 cm ]
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