What quantity is defined as the distance divided
by the time?
a) acceleration
b) velocity
c) speed
d) vector
c
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The energy emitted by the Sun comes from chemical reactions
a. True b. False Indicate whether the statement is true or false
What is created in pair production?
A) a proton and an electron B) a electron and an antiproton C) an electron and a positron D) an electron and a photon E) a proton and an antiproton
Which of the following particles will repel one another?
A. a neutron and a negative ion B. a proton and an electron C. a negative ion and an electron D. a neutron and a neutron
A fan, electric heater, and lamp are connected in parallel across a 120-V line. The resistances are Rlamp = 148 ?, Rheater = 32 ?, and Rfan = 48 ?. What is the total current supplied to the circuit?
a. 17.0 A b. 7.06 A c. 0.526 A d. 1.90 A