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Q. The engine weighs 4500 newtons and it is lifted 1.5 meters up by the block and tackle system. The mechanic must apply a force of 225 newtons while pulling a total of 37.5 meters of chain through the block and tackle pulley system. What is the work done by the block and tackle system?
Q. A concave shaving mirror has a focal length of 33 cm. Calculate the image position of a cologne bottle placed in front of the mirror at a distance of 93 cm. Calculate the magnification of the image. Is the image real or virtual? Is the image inverted or upright? Draw a ray diagram for the object to confirm your answer.
The springs of a 1300 {rm kg} car compress 6.0 {rm mm} when its 62 {rm kg} driver gets into the driver's seat. If the car goes over a bump, what would be the frequency of vibrations.
A proton moves perpendicularly to a uniform magnetic field at 5.0 107 m/s and exhibits an acceleration of 1.0 1013 m/s2 in the +x-direction when its velocity is in the +z-direction. find the magnitude and direction of the field.
How many 112 W lightbulbs can you use in a 100 V circuit without tripping a 15 A circuit breaker? (The bulbs are connected in parallel, that means that the potential difference across each lightbulb is 100 V.)
A metal block of mass m slides on a horizontal surface that has been lubricated with a heavy oil so that the block suffers a viscous resistance that varies as the 3/2 power of the speed F(v)=-cv^3/2. If the initial speed of the block is v0 at x=0,..
A force vector points at an angle of 50.6° above the +x axis. It has a y component of +280 newtons. Calculate the magnitude of the force vector.
A person driving her car at 49 km/h approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0 s before turning to red, and she is 30 m away from the near side of the intersection .
Define the frequency components of an AM signal and draw the AM signal for the given modulation index.
A gas expands while 502 J of energy is added to it as heat. The expanding gas does 422 J of work on its surroundings.
Assuming an electron free Earth. Find the force on a single proton just above Earths surface under these conditions. Compare your answer with the weight of the proton.
A miniblack hole formed as a superadvanced civilization decides to punish you (unfairly) by squeezing you until you become so small that you disappear inside your own event horizon. (Assume that your mass is 50).
A stone is thrown upward with an initial speed of 20 m/s. What is its acceleration at the highest point of its trajectory?
A little cat, Bella, walks in a straight line, which we shall call the x axis, with positive direction to the right. As an observant scientist, you make measurements of her motion and construct a graph of the little feline's velocity as a function..
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