A pulley block and tackle is used to lift a piano. The piano weighs 2000N. If the worker used 100 N of force to lift the piano, what is the mechanical advantage of the block and tackle?

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Astrology is considered which of the following types of science? Question 3 options: A. Pseudoscience B. Emerging science C. Non-science D. Scientific Law

A piece of metal has attained a velocity of 107.8 m/sec after fallinf for 10 seconds what is its initial velocity

The first few steps in deriving the quadratic formula are shown. Which best explains why is not added to the left side of the equation in the last step shown in the table?

Name the four types of particles found in the armoshpere

Which is the independent variable "year" or "degrees Celsius"?

A projectile is thrown upward so that its distance above the ground after t seconds is h (t) equals negative 16 t squared plus 704 t. a) Find the maximum height the object reaches. b) Find the time it takes the object to reach the ground.

You are standing 100 meters from an object emitting a sound of constant intensity (loudness). You walk toward the source of sound until you are 20 meters from it. From your perspective, what has happened to the intensity of the sound?

What is the peak emf generated by a 0.250 m radius, 500-turn coil is rotated one-fourth of a revolution in 4.17 ms, originally having its plane perpendicular to a uniform magnetic field. (This is 60 rev/s.)

How do credit cards use magnets to work?

Which of the following describes a physical change? A. Formation of a new substance caused by combining substances B. Water changing from liquid to gas through evaporation or boiling C. Formation of a new substance caused by application of heat