
A 56 sprinter, starting from rest, runs 60 in 7.8 at constant acceleration. Delisa Contreras What is the sprinter's average power output during the first 2.5 of his run? Express your answer us

items that repel each other?

A circuit contains two resistors (10 and 20 ) and two capacitors (12 F and 6 F) connected to a 6 V battery. The circuit has been connected for a long time. See attached file. a. Calculate the t

A 10 resistor and an 81.0 resistor are connected in parallel to a battery, and the current in the 10 resistor is found to be 1.00 A. Find the potential difference across the bat tery. A

a tennis ball of mass 0.058 kg initially at rest is served at avelosity of 45 m s1 . if the racket is in contact with the ball for 0.004 s whet is the net force on the ball during the serve ? (assume

A sample of 1.3*10^10 atoms that decay by alpha emission has a halflife of 100 min. How many alpha particles are emitted between t=50 min and t=200 min?

A certain medical machine emits xrays with a minimum wavelength of 0.029 nm. One day, the machine has an electrical problem and the voltage applied to the xray tube decreases to 79% of its normal va

A fishing boat is drifting just above a school of tuna on a foggy day. Without warning, an engine backfire occurs on another boat d = 1.2 km away (see figure). (a) How much time elapses before the

The equation of a wave is y (x,t) = (1.6cm) sin {pi/4.3cm [x  (66cm/s)t]} What is the wavelength of this wave? I know the amplitude is 1.6... not sure what the equation for this is!

What is the speed of the wave represented by y(x, t) = A sin(kx t), where k = 6.5 rad/cm and = 6.5 rad/s? _________ cm/s
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Sample Questions
 The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
 (a) What is the average angular acceleration of the Earth?
 (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
1. Can you show me step by step how to solve this problem?:
 A spherical balloon is made from a material whose mass is 3.00kg. The thickness of the material is negligible compared to the 1.5m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19kg/m^3. Find the absolute pressure of the helium gas
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?