Answer:
ow much work was done? W = F xD. IN X 2m = 2;. 2. A force of 15 newtons is ... 3. It took 50 joules to push a chair 5 meters across the floor. With what force was ... was done. How far was the rock lifted? W=FXD. D=1500 = 1.5m. Answer: :.5m ... A young man exerted a force of 9,000 newtons on a stalled car, but he was.
Explanation:
Answer:
D. 4000 km
Explanation:
f = Frequency of wave that is being transmitted = 76 Hz
= Wavelength of wave that is being transmitted
v = The velocity of electromagnetic waves through air = 
Velocity of a wave is given by

Hence, the approximate wavelength of the waves is 4000 km
To answer, we determine the velocity of the flea when it leaves the ground. Using the given value for distance, the velocity can be determined through the equation,
2a d = (Vf)² - (Vi)²
where a is the acceleration due to gravity, d is distance, Vf is the final velocity which is equal to zero and Vi is the initial velocity. Substituting the known values,
2(9.8 m/s²)(40cm/100cm) = (Vi)²
The value of Vi from the equation is 2.8 m/s.
The equation for determining the kinetic energy is:
KE = 0.5mv²
Substituting,
KE = 0.5(0.60 x 10^-3g)(1 kg/1000g)(2.8 m/s)²
KE = 2.352 x 10^-6 J