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1. A lead ball is dropped into a lake from a diving board 5.0 mabove the water. After entering the water, it sinks to the bottom with a constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom 3.0 s after it is released.How deep is the lake?
2. Mary needs to row her boat across a 100 m wide river that is flowing to the east at a speed of 1.0 m/s. Mary can row the boat with a speed of 2.0 m/s relative to the water.a) If Mary rows straight north, how far down stream will she land?b) Draw a picture showing Mary's displacement due to rowing, her displacement due to the river's motion, and her net displacement.(If you can)
Electrons with a speed of 1.6×10^6m/s pass through a double-slit apparatus. What speed must neutrons have to produce interference fringes with a fringe spacing of 1.6mm
a boy whirls a small stone attached to a 1.5m string in a horizontal circle 2.0m above the ground. the string suddenly
An airplane propeller is 2.38m in length (from tip to tip) and has a mass of 117kg. What is the angular acceleration of the propeller
The angular displacement of a rotating wheel is given by theta=18t^2+3t-2+(12/t^3). Find the angular acceleration and angular velocity
In 1994, Mata Jagdamba of India had very long hair. It was 4.23 m long. Suppose Mata conducted experiments with her hair. how large was the mass
A dipole (two equal and opposite charges) are placed 1 nm apart. What is the electric force on the -e charge due to the +e charge
You are driving to grocery store at 15 m/s .You is 140 m from an intersection when the traffic light turns red. Suppose that your reaction time is 0.70 s. and that your car brakes with constant acceleration. How far are you from the intersection whil..
A block of mass 5 kg slides without friction at a speed of 8 m/s on a table, How far is the spring compressed before the masses come to a rest
q1. the rotational inertia of a collapsing spinning star changes to 45 its initial value. what is the ratio of new
A goldfish lives in a 50-cm-diameter spherical fish bowl. The fish sees a cat watching it. how far from the edge does the fish see it as being
A physics professor demonstrates the Doppler effect by tying a 580HZ sound generator to a 1.0m--long rope and whirling it around her head in a horizontal circle at 120rpm . What is the highest frequency heard by a student in the classroom? What is th..
A system is acte on by its suroundings in such as way that is receives 50 J of heat while doing 20 J of work. What is its net change in internal energy?
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