Topic
Q:
d. The cable connecting the block to the electric motor abruptly breaks.
Catculate the acceleration of the block.
Q:
4. Un automóvil deportivo viaja a razón de 180
\( \mathrm{~km} / \mathrm{h} \). ¿Qué velocidad posee en \( \mathrm{m} / \mathrm{s} \) ?
Q:
The equation for a distance, \( s(\mathrm{~m}) \), travelled in time \( t(\mathrm{~s}) \)
by an object starting \( w \) th an initial velocity \( u\left(\mathrm{~ms}^{-1}\right) \) and
uniform acceleration \( a\left(\mathrm{~ms}^{-2}\right) \) is:
\[ s:=u t+\frac{1}{2} a t^{2} \]
he tasks are to:
a) Plot a graph of distance ( s\( ) \mathrm{vs} \) time ( t\( ) \) for the first
10 s of motion if \( u=10 \mathrm{~ms}^{-1} \) and \( a=5 \mathrm{~ms}^{-2} \).
b) Determine the gradient of the graph at \( t=2 \mathrm{~s} \) and
\( t=6 \mathrm{~s} \)
Q:
Un auto viaja a razón de \( 54 \mathrm{~km} / \mathrm{h} \). ¿Qu
velocidad posee en \( \mathrm{m} / \mathrm{s} \) ?
Q:
1-
A wire of unknown material is suspended vertically, and its length becomes \( 2 \times 10^{4} \mathrm{~m} \) when stress
of \( 8 \times 10^{8} \mathrm{~N} / \mathrm{m}^{2} \) is applied to it. Find the density of the wire in \( \mathrm{Kg} / \mathrm{m}^{3} \)
\( \begin{array}{llll}\text { (A) } 3600 & \text { (B) } 4581.1 & \text { (D) } 2300\end{array} \)
Q:
1. Nacrtaj ZATVORENI jednostavni strujni krug.
\( \begin{array}{l}\text { 2. Koje su značajke MAGNETSKE sile? } \\ \text { 3. Navedi dijelove elektromagneta; kako se može pojačati njegovo } \\ \text { djelovanje- nabroji načine. }\end{array} \)
\( \begin{array}{l}\text { 4. Zašto kažemo da je neko tijelo elektrizirano? Objasni. } \\ \text { 5. Kako se zove uređaj koji mjeri elektriziranost tijela? Kako on radi? } \\ \text { 6. Navedi dva razloga zašto se u kućnoj rasvjeti primjenjuje paralelni }\end{array} \)
spoj.
Q:
Two wires are made of the same material and have the same volume. The first wire has
cross-sectional area \( A \) and the second wire has cross-sectional area 4 A . If the length of the
first wire is increased by \( \Delta \mathrm{L} \) on applying a force F , how much force is needed to stretch
the second wire by the same amount?
\( \begin{array}{llll}\text { (A) } 2 \mathrm{~F} & \text { (B) } 6 \mathrm{~F} & \text { (C) } 16 \mathrm{~F} & \text { (D) } 9 \mathrm{~F}\end{array} \)
Q:
B) A catapult has two rubber arms, each with a square cross-sectiontrith a width 4 mm and
length 300 mm . In use its arms are stretched to four times their original length before release. Assume
the modulus of rubber is \( 10^{-3} \mathrm{GPa} \) and that it does not change when the rubber is stretched. How much
energy is stored in the catapult just before release?
\( \left(300 * 10^{-3}\right) \mathrm{m} \)
Q:
2) Cuanto pesa la carga de uno carretilla de
1,90 M de Longitud si la carga se encuentra a 70 cm
del apoyo y se está haciendo una fuerza de \( 23 \overrightarrow{\mathrm{~kg}} \)
Q:
- Input voltage \( =250 \mathrm{~V} \)
- Step-down transformer with ratio \( 16: 1 \)
- Low power battery charger supplies \( 153 \mathrm{~W}, 9,8 \mathrm{~A} \)
Now calculate the mean output voltage feeding the batterybank as
requested by the technician.
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