Your shopping cart has a mass of 65 kilograms. In order to accelerate the shopping cart down an aisle at 0.30 m/s2 What force would you need to use or apply to the cart. I don't know how to solve this
Justin ! Justin ! ! You're in high school Physics. You've done Newton's Laws until you saw them in your sleep. When the wind rustles through the trees, you almost hear it whispering to you "F = M A". Now is the time to use that ! M=65kg. A=0.3m/s^2. F = (65)(0.3)=19.5 newtons.
Which of the following statements is a consequence of the equation, E = mc2A energy is released when matter is destroyed B mass and energy are equivalent C the law of conservation of energy must be modified to state that mass and energy are conserved in any process D all of the choices
This is D. A - technically the matter is converted but yes E is released B - Mass and energy are different forms of each other C - They can now combine to form the conservation of mass AND energy
True or False Another name for constructive interference is intense interference
The answer to this statement is FALSE
What happens as a result of an increase in the intensity of a sound wave? -the frequency of a soundwave increases. -the velocity of the sound wave decreases. -the energy of the soundwave increases. -the amplitude of the soundwave decreases
As a result of an increase in the intensity of a sound wave, the energy of the sound wave increases!
Answer: c. The energy of the sound wave increases.
What is the minimum coating thickness (but not zero) that will minimize the reflection at the wavelength of 705 nm where solar cells are most efficient?
d = 235 nm.
Let the layer be of glass. Refractive index of glass μ = 1.5. Let the required thickness be d.
For minimum reflection , that is destructive interference in thin films , the condition is
2μd = λ ( for first order)
d = 705 / 2 x 1.5 = 235 nm [ λ =705 nm ]
2 examples of all 7 wave behaviors
All waves behave in certain characteristic ways. They can undergo refraction, reflection, interference and diffraction.
An ultrasound wave vibrates 30,000 times per second. what is the frequency
The frequency is 30,000 per second. That's the same thing as 30 KHz.