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A lifeguard is working at a pool sitting in his guard stand. He notices a child right below him drowning that appears to be 1.5 m below the surface of the water? How deep is the child actually? Suppose he is sees the child at a very small angle, and utilize the small angle approx. of sinθ= tanθ = θ
An elastic cord is 65 cm long while a weight of 56 N hangs from it and is 82 cm long while a weight of 84 N hangs from it. What is the spring constant of this elastic cord.
A wheel rotates with a constant angular acceleration of 3.75 rad/s2. Assume the angular speed of the wheel is 2.20 rad/s at ti = 0. Through what angle does the wheel rotate between t = 0 and t = 2.00 s
A parallel-plate air capacitor is made from two plates 0.205m square, spaced 0.830cm apart. It is connected to a 120 V battery. What is the energy stored in the capacitor
A bottle has a mass of 35.00g when empty and 98.44g when filled with water. When filled with another liquid, the mass is 88.78g. What is the specific gravity of this other fluid
A long string of tension T and mass density η is attached to a small sphere of mass m. What is the displacement of the string on the right side of the mass
a cat with mass 4.5 kg is sitting on top of a turntable of mass 20 kg and radius 1.4 m. Calculate the magnitude of the angular velocity of the turntable in rotations per minute
a 2.6-kg shere of radius 35cm is intially rolling on a flat surface with a speed of v.40 ms. it comes to rest in 80m.
The sun, mass 2.0 X 10^30 kg, is revolving regarding the center of the Milky Way galaxy, which is 2.2 X 10^20 m away. It completes one revolution each 2.5 X 10^8 years. Estimate the number of stars in the Milky Way.
A liquid hydrogen target of the thickness of 1cm and density of 0.071 g/cm3 is bombarded with a rare isotope beam of 60Ca with an intensity of 100 counts per second. The reaction p(60Ca,60Ca(2+))p’ is observed by detecting the photons from the dec..
In a physics lab experiment, a student immersed 205 one-cent coins (each having a mass of 3.00g ) in boiling water. After they reached thermal equilibrium, she quickly fished them out and dropped them into 0.236kg of water at 20.0 C in an insulate..
a train moving at a constant speed of 58.0 kmh moves east for 45.0 min then in a direction 56.0deg east of due north
Suppose you place your face in front of a concave mirror. Which one of the following statements is correct?
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