Answer:
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A :-) For this question , we should apply
v = u + at
Given - u = 40 m/s
a = 2.5 m/s^2
t = 12 sec
Solution -
v = u + at
v = 40 + 2.5 x 12
v = 40 + 30
v = 70 m/s
.:. The new speed is 70 m/s.
( speed = velocity ).
Answer:
Explanation:
Given:
- Acceleration a_dry = 0.4*a_wet
- initial velocity V_i
Find:
By how much does time taken to stop of dry snow differ from time taken to stop on wet snow?
Solution:
- Time taken to stop on wet snow t_wet:
V_f = V_i + a_wet * t_wet
t_wet = - a_wet / V_i
- Time taken to stop on wet snow t_wet:
V_f = V_i + a_dry * t_dry
t_dry = - a_dry / V_i
- Difference in t_wet and t_dry:
t_dry - t_wet = - a_dry / V_i + a_wet / V_i
dt = (a_wet - a_dry) / V_i
dt = (a_wet - 0.4*a_wet) V_i
dt = 0.6*a_wet / V_i
Answer:
F = 0
Explanation:
The magnetic force is described by two expressions
for a moving charge
F = q v x B
for a wire with a current
F = I L xB
bold indicates vectors
let's write this equation in module form
F = I L B sin θ
where the angle is between the direction of the current and the direction of the magnetic field
In this case they indicate that the cable goes from the South wall to the North wall, so this is the direction of the current
The magnetic field of the Earth goes from the south to the north and in this part it is horizontal
Therefore the current and the magnetic field are parallel, the angle between them is zero
sin 0 = 0
consequently the magnetic force is zero
F = 0
