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A movable pulley is a simple machine which halves the force necessary to lift a load, while a fixed pulley can only change the direction of force. It cannot change the magnitude of force. In this regard, calculate the mechanical advantage of the system shown in the figure below.
If the big wheel (A) turns 3 times at clockwise direction, how many times and in which direction does the small one (B) turn?
If gear A rotates in the clockwise direction, what will the direction of wheels B, C and D be?
Which statement below is WRONG about springs?
A football player kicks a football at a velocity of 50.0 m/s, making an angle of 37º with the horizontal. What is the time of flight of the ball? Take the value of g = 9.81 m/s2. Write everything you calculate at 3 s.f.
(sin 37º =0,6 cos37º =0.8)
Centripetal force is proportional to
A 12N force is required to turn a screw of body diameter equal to 6mm and 1mm pitch. Calculate the driving force acting on the screw. Write the answer at 3 s.f.
Which statement is CORRECT about air pressure?
The advantage/s of a series circuit to a parallel one is that
A load of 300 N is held with a force of 1200 N. If the force is acting at a point 25 cm away from the fulcrum, what is the length of the lever in metres?
How many revolutions does the wheel M make when K completes 4 revolutions?
What is the rotation velocity and direction of wheel C if the wheel A makes 30 rot / min? (RA = 3RB and RC = 2RB).
If the weight of each pulley is equal to the load, what is the ratio between the pulling force F and the load L? (F / L = ?)
Which statement is WRONG about springs?
The second half (while falling down) of the vertical component of a complete ballistic trajectory is:
Which statement is WRONG about circular motion?
What class of levers does the inclined plane represent?
If a liquid becomes twice denser and the depth of an immersed object in this liquid halves, the liquid’s pressure:
What is the main difference between a cell and a capacitor?
We use __?__ to measure a specific gas pressure
What happens to the current passing through the main branch in the circuit shown in the figure if one the bulbs smashes?
Which statement about levers is CORRECT?
Pedals of a bicycle are 8 inches long and the wheel diameter is 48 inches. What is the mechanical advantage of this bicycle?
How many inches must one pull the rope down in order to lift the load in the figure by 28 inches?
The two projectiles in figure are fired from the points K and L at the same instant. What is the relation between u1 and u2, if both of them are to land on the same point P and at the same instant as in figure?
What would happen to the distance Earth-Sun if one year became 400 days without any change in the gravitational force?
A screw is a combination of:
What is the pressure exerted on the ground if a 400 N object is placed on the conic platform as shown in the figure? The weight of conic platform is negligible.
We must put a __?__ before an expensive circuit component to prevent it from burning by the excessive current.
Why can we not use the equation P = ρ · g · h for calculating the air pressure at a height h taking as a reference level the upper part of the atmosphere?
In parallel combination of bulbs, when a bulb smashes, the other bulbs:
An electric iron gets hotter but the cable carrying the current to the iron is cool. This, because:
Which statement regarding magnets is CORRECT?
What kind of lever is the hydraulic crane shown in the figure?
Which term is NOT related to gears?
In which direction does the 4th wheel rotate if the first wheel rotates clockwise?
A uniform rod can be hold in equilibrium with the help of a system of pulleys as in the figure. What is the weight of the rod if the force F=3N? (Remember that the weight of the rod acts at the center of gravity of the rod which is at its middle).
What is the load shown in the figure in Newtons if the springs are all identical (k = 4000N/m each) and the total extension of all springs is 20cm?
Which quantity remains constant during a ballistic trajectory?
Which statement is CORRECT?
A wooden rectangular object is 15cm high as shown in the figure. What is the pressure exerted by the object on the ground given that the density of wood is 600 kg / m3? Take g = 9.81 m/s2. Write the answer as a whole number.
Electrons in a circuit flow from a place where there are __?__ electrons to a place where there are __?__ electrons.
A gas has a volume of 10 lt and a pressure of 4 atm initially. If after a process its volume becomes 20 It, what will its final pressure be in cm-Hg?
Which of the following does NOT use magnetism to operate?
Which method is NOT used to make a magnet?
Belts usually are made from materials that __?__ friction.
Which statement is wrong regarding the situation shown in the figure below? The event occurs from left to right.
What is the rotation speed (in km/h) of a given point on the Earth’s surface? The radius of Earth is about 6370 km. Write the answer as a whole number.
What value does the voltmeter in the circuit shown in the figure read?
Which of the following materials can become a magnet?
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