Answer: 65000 seconds
Explanation:
Given that,
Current (I) = 2 mA
(Since 1 mA = 1 x 10^-3A
2 mA = 2 x 10^-3A)
Charge (Q) = 130 C
Time taken for a fully charged phone to die (T) = ?
Recall that the charge is the product of current and time taken.
i.e Q = I x T
130C = 2 x 10^-3A x T
T = 130C / (2 x 10^-3A)
T = 65000 seconds (time will be in seconds because seconds is the unit of time)
Thus, it will take a fully charged phone 65000 seconds to die
Answer:
a
b
Explanation:
From the question we are told that
The distance travel in 4.22 s is
The mass of the cart plus the fan is
Generally from kinematic equation we have that
Here u is the initial velocity with value
So
=>
Generally the net force is
=>
=>
Gnerally the new mass of the cart plus the fan is
The distance considered is
Generally the new acceleration of the cart is mathematically represented as
=>
=>
=>
Gnerally from kinematic equation we have
Here u is the initial velocity and the value is zero because it started from rest
=>
=>
Answer:
100 ly are
Explanation:
The speed of light is, by definition (we define this and derive a definition of distance from there nowadays), c=299792458m/s. We want to know, at this speed, how much distance the radio signals travel in 100 years. Since each year has 365 days (not a leap one though), each day has 24 hours, each hour has 60 minutes and each minute has 60 seconds, the number of seconds in a year will be (365)(24)(60)(60)=31536000, so the distance traveled by the waves in 100 years will be:
, which, of course, are 100 light years.
Answer:
Explanation:
mass, m = 1 kg
specific heat, c = 1.5 J/g°C
rise in temperature, ΔT = 41 - 21 = 20
heat released, H = m x c x ΔT
H = 1 x 1.5 x 1000 x 20
H = 30,000 J
H = 30 kJ.