Topic
Q:
A horizontal force of magnitude 80 kg .wt is applied to a container of
weight 80 kg ,wt containing 24 boxes, each box of weight \( 20 \mathrm{~kg}, \mathrm{wt} \) on a
rough horizontal ground. The coefficient of static friction between it and
the container is \( \frac{1}{6} \), find the number of boxes that must be removed so
that the container is about to move on the ground.
Q:
A horizontal force of magnitude \( 80 \mathrm{~kg} . \mathrm{wt} \) is applied to a container of
weight 80 kg ,wt containing 24 boxes, each box of weight 20 kg ,wt on a
rough horizontal ground. The coefficient of static friction between it and
the container is \( \frac{1}{6} \), find the number of boxes that must be removed so
that the container is about to move on the ground
Q:
Calcular el trabajo para elevar hasta 12 metros en cuerpo de 15 kgf
2) Se eleva un cuerpo hasta 3 m mediante un trabajo de 75 kgm ¿Cuál es el peso del
cuerpo?
3) Para subir un tonel hasta 3 m de altura ha sido neceṣario un trabajo de 240 kgm ¿Cuánto
pesa el tonel?
4) ¿Qué trabajo (en Julio y kilovatios-hora) realizará un hombre para elevar una bolsa de
70 kgf a una altura de \( 2,5 \mathrm{~m} \) ?
5) ¿Qué energía cinética alcanzará un cuerpo que pesa 38 kgf a los 30 segundos de caída
libre?
Q:
मयाधान: \( \mathrm{E}=\frac{\mathrm{hc}}{\lambda}=\frac{6.63 \times 10^{-34} \times 3 \times 10^{6}}{3000 \times 10^{-10}} \mathrm{~J}=6.63 \times 10^{-19} \mathrm{~J}=4.14 \mathrm{eV} \)
\[ \mathrm{E}_{\mathrm{k}}=\mathrm{E}-\phi=(4.14-2.3) \mathrm{eV}=1.84 \mathrm{eV} \]
02. UV radiation having a 300 mm wavelength falls on uranium metal, ejecting 0.5 cV electrons. What is the
binding energy of electrons to uranium metal? (Planck's constant \( =6.63 \times 10^{-34} \mathrm{kgm}^{2} \mathrm{~s}^{-1} \) )
Q:
A body of weight \( 30 \mathrm{~kg} . \mathrm{wt} \) is placed on a rough horizontal plane. A
horizontal force of magnitude Fkg .wt is applied to it, making it about to
move. If the measure of the angle between the resultant reaction and the
limiting friction force is \( \theta \), where \( \cos \theta=\frac{5}{13} \). find the value of the
resultant reaction.
Q:
A cold piece of metal is placed into a cup of hot water. This causes the temperature
of the water to fall \( 5.25^{\circ} \mathrm{C} \). The original temperature of the water was \( 62.4^{\circ} \mathrm{C} \). What is
the new temperature?
Q:
6. Como a gravidade e a força centrípeta influenciam atividades do dia a dia, como
andar de bicicleta em uma curva?
- Relacione como a força centrípeta mantém o ciclista na trajetória curva e como a
velocidade afeta essa força.
Q:
14. Seorang ilmuwan melakukan percobaan menembakkan proyektil. Proyektil
ditembakkan ke udara dengan sudut tertentuterhadap horizontal, dan selama
bergerak, proyektil mengikuti lintasan parabola. Ketinggian proyektil dalam \( h \)
meter terhadap waktu \( t \) dalam detik setelah ditembakkan dapat dinyatakan
dengan persamaan \( h(t)=-4 \mathrm{t}^{2}+16 \mathrm{t}+50 \).
Jika kelajuan proyekti sepanjang sumbu horizontal sebesar \( 10 \mathrm{~m} / \mathrm{s} \), maka jarak
horizontal proyektil saat ia mencapai titik maksimum diukur dari titik awal ia
ditembakkan adalah ....
a. 10 m
b. 20 m
c. 30 m
d. 40 m
e. 50 m
Q:
15. In an archery competition, an archer stands on a hill so that the arrow in her bow is 20.0 meters
above the ground and is aimed at an angle of \( 0^{\circ} \) relative to the ground. If the archer is trying to hit a
target that lies on the ground 118 m away, with what initial velocity must she launch her arrow?
(NOTE: The picture is not drawn to scale.)
Q:
14. A diver is on a hill overlooking a lake. If the hill is 45 feet above the surface of the water and the
liver jumps horizontally \( \left(\theta=0^{\circ}\right) \) with an initial speed of \( 20.0 \mathrm{ft} / \mathrm{sec} \), how far from the hill will the
iver hit the lake?
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