In a ballistics test, a bullet moving horizontally with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm
(a) What is the magnitude of the average acceleration of the bullet in the sandbag? (b) How many milliseconds does it take the bullet to come to rest in the sandbag?
(a) 1.25 × 106 m/s2 (b) 0.400 ms
You might also like to view...
What do we mean by inflation?
A) the rapid expansion of the universe, driven by white dwarf supernova, that we still observe today B) the expansion of universe starting with the instant after the Big Bang C) the sudden release of photons when particles and antiparticles annihilate each other D) a sudden expansion of the universe driven by the energy released when the strong and electroweak forces froze out from the GUT force E) the photons released when electrons and protons first combined, forming the Cosmic Microwave Background Radiation
Energy and Momentum: An object initially at rest suddenly explodes in two fragments of masses 2.6 kg and 3.3 kg that move in opposite directions. If the speed of the first fragment is 3.6 m/s, find the internal energy of the explosion.
A. 30 J B. 30 kJ C. 38 J D. 38 kJ
An atom can be excited
a. if it emits a photon. b. if it collides with another atom or electron. c. if it absorbs a photon. d. if it emits a photon or if it collides with another atom or electron. e. if it collides with another atom or electron or if it absorbs a photon.
A ___________ has a few million light-sensitive diodes in an array typically about a half-inch square
a. photometer b. charge-coupled device c. spectrograph d. photographic plate e. grating