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a. Draw a circle and indicate the velocity vector and the acceleration vector at some time between 0 and 30s. b. What is the tangential acceleration?
Question: A 5.0- strand of DNA carries charge per of length. Treating it as a charged line, what's the electric field strength 21 from the DNA, not near either end?
The attractive electrostatic force between the point charges 7.35x10^-6C and Q has a magnitude of 0.400N when the separation between the charges is 2.92m. Find the sign and magnitude of the charge
If the seal's surroundings are a frosty -19degrees celsius, what is the net rate of energy loss by radiation? Assume an emissivity equal to that of a human.f
A container holds 0.60g of argon at a pressure of 9.0atm. Part A: How much heat is required to increase the temperature by 100 degrees celsius at constant volume?
What is the greatest possible rate of energy transfer by radiation from a metal cube 2.4cm on a side that is at 720 degrees Celsius? Its emissivity is 0.40
At 12 breaths per minute, what is the rate of energy loss due to evaporation? Express your answer in watts. At body temperature, the heat of vaporization of water is Lv = 24X10^5 J/KG
Find the thrust factors required and show that the speed in the final orbit is two times greater than the initial speed.
An object undergoes projectile motion where friction is negligible and the acceleration due to gravity g is constant. If the object's initial velocity was at an angle (< 90 degrees) above the hor
While walking around your apartment in socks you shuffle your feet across the floor and realize that you've accumulated a positive charge of +9 nC (9 x 10^-9 C). How many electrons have been removed
A lamp which is 9.0 cm tall is in front of a concave mirror which has a focal length of 53.0 cm. (a) How tall is the lamp's image if the lamp is a distance of 26.5 cm from the mirror (include sign if
Question: An golf ball sits on the optical axis of a spherical mirror at a distance of 17 cm. A virtual image is formed a distance of 6 cm away from the mirror. What is the mirror's focal length (i
Give some examples of the applications of lasers in the medical field, industry, and in commerce?
The frequncy doubled output of a laser has a wavelength of 532nm. If each pulse of light has a total energy of 0.550J and the repetition rate of the laser is 30Hz, how many photons does the laser e
The height of a helicopter above the ground is given by h = 2.95t^3, where h is in meters and t is in seconds. At t = 2.50 s, the helicopter releases a small mailbag. How long after its release doe
A truck covers 42.0 m in 8.10 s while smoothly slowing down to final speed of 2.70 m/s. (a) Find its original speed. (b) Find its acceleration. (Indicate the direction of the acceleration with the
A hare and a tortoise compete in a race over a straight course 1.25 km long. The tortoise crawls at a speed of 0.300 m/s toward the finish line.
Assume that none of the alpha particles bounced back from the sheet, meaning that the alpha particles either were captured by the shielding or penetrated completely through the shielding. What perce
At three corners of a rectangle (length 11.8 cm, height 5.9 cm), the following charges are located: q1 (upper left corner), q2 (lower right corner), and q (lower left corner). The net electric fiel
A particle moves along a straight line with an acceleration of a = 2pi / (2s^(2/3) + 3s^(5/8)) m/s^2, where s is in meters. Determine the particles velocity when s = 2 m, if it starts from rest whe
A velocity "filter" with crossed electric and magnetic fields is designed to permit the passage of singly ionized 22-Ne atoms (atomic mass=22 unified atomic mass units) of energy 2.0*10^4 eV. The el
How would you calculate many electrons are transferred with each rotation by the Van de Graff generator? As is known, the Van De Graff generator is spherical and the one I used in particular had a c
Two spherical objects with a mass of 8.05 kg each are placed at a distance of 2.31 m apart. How many electrons need to leave each object so that the net force between them becomes zero?
Birds resting on a high-voltage power lines are a common sight. A certain copper power line carries a current of 52.7 A, and its resistance per unit length is 1.15 10-5 /m. If a bird is standing on