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A 28.0 child plays on a swing having support ropes that are 2.10 long. A friend pulls her back until the ropes are 45.0 from the vertical and releases her from rest.
What is the potential energy for the child just as she is released, compared with the potential energy at the bottom of the swing?
How much work does the tension in the ropes do as the child swings from the initial position to the bottom?
Illustrate what should be the other mass so that the displacement of either mass during the first second following release is 0.34 m? Assume a massless, frictionless pulley and a massless string.
If the create has a mass of 110 and is 1.60 tall and 0.80 in depth and width, what is the minimum force needed to make the crate start tipping? (Assume the center of mass of the crate is at its center and static friction great enough to prevent sl..
Consider the four masses. Find the total gravitational potential energy of this system. How does your answer to part A change if all the masses in the system are doubled.
A child's toy consists of a piece of plastic attached to a spring. The spring is compressed against the floor a distance of 2.0 cm and released. If the spring constant is 85 N/m, what is the magnitude of spring force acting on the toy at the moment i..
A steel aircraft carrier is 385 m long when moving through the icy North Atlantic at a temperature of 1.65°C. By how much does the carrier lengthen whereas it is travelling in the warm Mediterranean Sea at the temperature of 23.30°C.
A current of 10^-14 A is produced in a free-air chamber operating under saturation conditions. The sensitive volume, in which electronic equilibrium exists, contains 0.22g of air. What is the exposure rate .
Three equal point charges, each with charge 1.95 , are placed at the vertices of an equilateral triangle whose sides are of length 0.400 . What is an electric potential energy of the system? (Take as zero the potential energy of the three charges ..
A Norwich MCE student is involved in a crucial out of class experiment. He is in his dorm room 34 feet above an historic rock wall. Describe the final result and state any assumptions that you need to make. Would the final result be any different o..
If the LED emits light from a circle with diameter 10mm and is to couple to the fiber which has a50 micro meter diameter core .assume it radiates with afull cone angle 30 degree.
What is the wavelength of radio waves. An electron in a TV is accelerated toward the screen across a potential difference of 54.2kV. How much kinetic energy does the electron gain while accelerating.
Two negative chrges are placed on the x-axis. A charge of -11.4 micro coulmbs is placed at x=0cm and another charge of -5.4 m/C is placed at x=119cm. where on the x axis is the total field between the two charges zero? Answer in cm
What is the angular momentum of a 3.2 kg uniform cylindrical grinding wheel of radius 12cm while rotating at 1400 rpm.
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