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A device used in radiation therapy for cancer contains 0.83 g of cobalt-60 (59.933 819 u). The half-life of this isotope is 5.27 yr. Determine the activity (in Bq) of the radioactive material.
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Question: The radius of the earth's very nearly circular orbit around the sun is 1.5x10^11m. Find the magnitude of the earth's velocity as it travels around the sun. Assume a year of 365 days. Find the magnitude of the e ...
An object falls because of gravity at a rate of -980 cm/s2 (- sign is indicative of a downward direction) for 10. seconds. If it starts from rest (vo = 0) and its position starts from do= 0.0, where is it 10. seconds lat ...
Question: A particle leaves the origin with an initial velocity v = (3.00 i hat) m/s and a constant acceleration a = (-3.00 i hat - 1.400 j hat) m/s2 (a) What is the velocity of the particle when it reaches its maximum x ...
Question: A thin, horizontal, 20-cm-diameter copper plate is charged to 4.0 nC . Assume that the electrons are uniformly distributed on the surface a) What is the strength of the electric field 0.1 mm above the center of ...
Question: A small, 300 g cart is moving at 1.90 m/s on an air track when it collides with a larger, 5.00 kg cart at rest. After the collision, the small cart recoils at 0.890 m/s. Part A: What is the speed of the large c ...
Question: Standing waves on a wire are described by y(x,t)=(ASWsinkx)sin?t, with ASW = 3.00mm , ? = 975rad/s , and k = 0.790?rad/m . The left end of the wire is at x = 0. Part A: At what distances from the left end are t ...
Question: Part A: At what angle θ1 to the normal would the first dark ring be observed? Part B: Suppose that the light from the pinhole projects onto a screen 3 meters away. What is the radius of the first dark ring on ...
A projectile is launched at an angle of 13.0° above the horizontal. What is its initial speed if it hits a target that is located a horizontal distance of 155 m from the launch point and 10.5 m below the launch level?
How are chemical and physical changes different. What are some demonstrations that you might do to help your students differentiate between a chemical and physical change?
A slab of clay with a mass of 0.26 kg, moving with a speed of 5.24 m/s, hits a stationary toy car of mass 0.54 kg. If the clay hits and sticks to the car, what is the speed of the clay and car (which are now moving fused ...
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Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate
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