Answer:
b. The bicyclist is exerting 49 N of force
Explanation:
Given;
mass of bicyclist start, m = 50 kg
acceleration, a = 1 m/s²
density of air, ρ = 1.2 kg/m³
velocity, v = 2 m/s
Area of the bicyclist body, A = 0.5 m²
The drag force on the bicyclist is given by ;
Fd = 0.5CρAv²
where;
C is drag coefficient = 0.9 for bicycle
Fd = 0.5 x 0.9 x 1.2 x 0.5 x 2²
Fd = 1.1 N
The force of the bicyclist is given by;
F = ma
F = 50 x 1
F = 50 N
The effective force exerted by the bicyclist is given by;
Fe = F - Fd = 50 N - 1.1 N
Fe = 49 N
Therefore, the force exerted by the bicyclist is 49 N
Answer:
the seesaw will still be balanced, nothing will happen to it
Explanation:
the principle of moment states that for a body to be in equilibrium the sum of anticlockwise moment must be equal to the sum of anticlockwise moment
also
The sum of upward forces must be equal to the sum of downward forces
a=weight of the heavy person
b=weit of the lit person
x=distance of the heavy person from the fulcrum
y=distance of the lit person from the fulcrum
now that they both moved 25cm towards the pivot
a*(x-25)= b*(y-25).......................1
Explanation: Mass is Kilogram
Weight is Newton
Answer:
4°C
Explanation:
Water is densest at 4°C. Since dense water sinks, the bottom of the lake will be 4°C.
The direction of the magnetic field around a wire depends on
the direction of the current flowing through the wire. When you
change the direction of the current in the wire, the direction of the
magnetic field around it also changes direction.
The current in every electric cord in your house changes its direction
120 times every second. So the magnetic field around every electric
cord in your house also changes its direction 120 times every second.