<span>Force F = 280 N
Angle with the ground = 40 degrees
Weight of the Lawnmower = 350 N
Velocity is constant so Acceleration is 0
So Forward force Ff = F cos theta = 280 cos40
Frictional force with resists to back Fb = (u x Force from pressure) + vertical component of Force, where u is the coefficient of friction.
Fb = (u x m x g) + (u x 280sin40)
AS Ff = Fb => 280 cos40 = u x ((m x g) + 280sin40)
u = 280 cos40 / ((350 x 9.81) + 280sin40) = 214.49 / () = 0.405
So the coefficient of friction u = 0.405</span>
Answer:
Lighting Brightness: Lumens vs. Watts. Lighting technology has evolved tremendously in the past 10 years. Prior to the introduction of energy efficient light bulbs, wattage was a common measurement used to determine brightness for incandescent light bulbs.
Explanation:
Answer:
I = 7.5*10^-10 kg m/s
Explanation:
In order to calculate the impulse you first take into account the following formula:
(1)
m: mass of the pollen grain = 1.0*10^-7g = 1.0*10^-10 kg
v: final speed of the pollen grain = ?
vo: initial speed of the pollen grain = 0 m/s
Next, you calculate the final speed of the pollen grain by using the information about the acceleration and time. You use the following formula:
(2)
a: acceleration = 2.5*10^4 m/s^2
t: time = 0.30ms = 0.30*10^-3 s
Next, you replcae this value of v in the equation (1) and calculate the impulse:
The impulse delivered to the pollen grain is 7.5*10^-10 kg m/s
Risk of not being able to reduce their weight
Answer:
one electron
Explanation:
An atom with potassium has one electron in its outer energy level. This isn't a sturdy outer energy level. Keep in mind that, with majority of the elements a stable outer energy level has 8 electrons. When it blends with iodine, potassium loses an electron from level 4
