Soaring Crane
Jan21-07, 09:59 AM
1. The problem statement, all variables and given/known data
An electron is released from rest in a uniform electric field of 1.25 kN/C. After 20 ns, the electron's speed will be approximately
a. 2.5 x 10^-5 m/s
b. 3.9 x 10^3 m/s
c. 3.0 x 10^8 m/s
d. 2.5 x 10^3 m/s
e. 4.4 x 10^6 m/s
2. Relevant equations
Vector E = (m_e*a)/q_e
v_f = v_i +a*t
3. The attempt at a solution
a = (E*q_e)/m_e = [(1250 N/C)*(1.60*10^-19 C)]/(9.11*10^-31 kg) = 2.1954*10^14 m/s^2
v_f = v_i +a*t, where v_i = 0 m/s
v_f = a*t = (20*10^-9 s)*(2.1954*10^14 m/s^2) = 4.39*10^6 m/s (E.) ???
1. The problem statement, all variables and given/known data
How many electrons must be transferred to a body to produce a charge of 125 nC?
a. 1.25 10^-7
b. 7.81 10^11
c. 1.28 10^12
d. 3.45 10^11
2. Relevant equations
Total q / q_e = # of electrons
3. The attempt at a solution
(125*10^-9 C)/(1.60*10^-19 C) = 7.813*10^11 electrons ???
Thanks.
An electron is released from rest in a uniform electric field of 1.25 kN/C. After 20 ns, the electron's speed will be approximately
a. 2.5 x 10^-5 m/s
b. 3.9 x 10^3 m/s
c. 3.0 x 10^8 m/s
d. 2.5 x 10^3 m/s
e. 4.4 x 10^6 m/s
2. Relevant equations
Vector E = (m_e*a)/q_e
v_f = v_i +a*t
3. The attempt at a solution
a = (E*q_e)/m_e = [(1250 N/C)*(1.60*10^-19 C)]/(9.11*10^-31 kg) = 2.1954*10^14 m/s^2
v_f = v_i +a*t, where v_i = 0 m/s
v_f = a*t = (20*10^-9 s)*(2.1954*10^14 m/s^2) = 4.39*10^6 m/s (E.) ???
1. The problem statement, all variables and given/known data
How many electrons must be transferred to a body to produce a charge of 125 nC?
a. 1.25 10^-7
b. 7.81 10^11
c. 1.28 10^12
d. 3.45 10^11
2. Relevant equations
Total q / q_e = # of electrons
3. The attempt at a solution
(125*10^-9 C)/(1.60*10^-19 C) = 7.813*10^11 electrons ???
Thanks.