Topic
Q:
Un auto viaja a una velocidad
constante de \( 108 \mathrm{~km} / \mathrm{h} \) y 500 m
por detrás viene en su
persecución otro vehículo con
velocidad de \( 18 \mathrm{~km} / \mathrm{h} \) que va a
acelerando a razón de \( 0.5 \mathrm{~m} / \mathrm{s}^{2} \).
Responder:
1. El tiempo que tarda el auto
con aceleración en alcanzar al
otro auto.
2. La distancia que recorre cada
uno hasta el encuentro.
3. La velocidad que tendrá el
auto qué acelera justo en el
encuentro.
Q:
34. A water-skier lets go of the tow rope upon leaving the end of a
jump ramp at a speed of \( 14.0 \mathrm{~m} / \mathrm{s} \). As the drawing indicates, the
skier has a speed of \( 13.0 \mathrm{~m} / \mathrm{s} \) at the highest point of the jump. Ignor.
ing air resistance, determine the skier's height \( H \) above the top of the
ramp at the highest point.
Q:
A gear with a \( 20^{\circ} \) pressure angle and a pitch circle diameter of 200 mm is
situated between two bearings. The gear is driven by a 120 kW power source
and rotates at \( 150 \mathrm{r} / \mathrm{min} \).
Calculate the following:
6.2.1 The torque transmitted
5.2.2 The tangential force on the gear
.2.3 The normal force on the gear
2.4 The radial force on the gear
Q:
Question 4; A machine is \( 10 \% \) efficient. A work input of 350 J is used, find the work output done by
the machine. ( 3 marks)
Q:
Question 3: The total energy going into a washing machine is 900 J . The usaful energy coming
put is only 45J. Calculate the effeciency ( 2 marks)
Q:
Question 8: The potential energy of 5 Kg mango is 1600 J . How high was the mango to have this
much potential energy. ( 2 marks)
Q:
The speed of sound in air is \( 340 \mathrm{~ms}^{-2} \). A loudspeaker placed between two walls A and \( \mathrm{B}, \mathrm{br} \)
nearer to wall A than B , is sending out constant sound pulses. How far is the speaker from
wall B if it is 200 m from wall A and the time between the two echoes received is 0,176
seconds?
Q:
\( \frac{\text { Question 9: }}{\text { (3 marks). }} \) The kinetic energy of an 8 Kg ball is 64 J . Calculate the speed of it when being rolled.
Q:
A stationary player accelerates from the home plate to first base.
The player takes 6.61 s to get to first base and arrives moving at 5.45 m s
(a) Show that the average acceleration is \( 0.825 \mathrm{~m} \mathrm{~s}^{-2} \).
Q:
Q1. A ferromagnetic core is shown in Figure Q1. The depth of the core is 12 cm . The other dimensions
of the core are as shown in the figure. By assuming the magnetic leakage to be negligible and relative
permeability of the core is 1000.
(i) Calculate the total reluctance.
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