Radioactivity b 1996
discovered radio when operimenting
The terococtity was cold by Becquerels doctoral student
She was the best w two Nobel -
physes the only woman to win ton, and the only person to win
Serent categones
died in 1934 ton poisoning The congers of radiation were not
to at that time. The papers and wortbois une used are sail stored
tody doe to their high levels of racist
comed out more in todiac
From 1898 und his death in 1937 he so prole in this discover the
The discovery occactivity led to as to turn into a useful tool. This
led ently to building recorrectors to provide clectric too cheap
to restos odletised in 1954 also led to the same of

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Aball is thrown upward. at a height of 10 meters above the ground, the ball has a potential energy of 50 joules (with the potential energy equal to zero at ground level) and is moving upward with a kinetic energy of 50 joules. what is the maximum height h reached by the ball? consider air friction to be negligible. 1. h ≈ 10 m 2. h ≈ 50 m 3. h ≈ 30 m 4. h ≈ 40 m 5. h ≈ 20 m 003 10.0 points which of the two object shown below has the greatest kinetic energy? a m b 1 2 m v 2v 1. kinetic energies are the same. 2. a 3. b 4. unable to determine. 004 10.0 points tim, with mass 74.6 kg, climbs a gymnasium rope a distance of 3.1 m. the acceleration of gravity is 9.8 m/s 2 . how much potential energy does tim gain? answer in units of j. 005 10.0 points a car is moving at 64 miles per hour. the kinetic energy of that car is 5 × 105 j. how much energy does the same car have when it moves at 111 miles per hour? answer in units of j. 006 10.0 points an 102 kg man climbs up a 1 m high flight of stairs. the acceleration of gravity is 9.81 m/s 2 . w

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.