Answer:
Δv = 12 m/s, but we are not given the direction, so there are really an infinite number of potential solutions.
Maximum initial speed is 40.6 m/s
Minimum initial speed is 16.6 m/s
Explanation:
Assume this is a NET impulse so we can ignore friction.
An impulse results in a change of momentum
The impulse applied was
p = Ft = 1400(6.0) = 8400 N•s
p = mΔv
Δv = 8400 / 700 = 12 m/s
If the impulse was applied in the direction the car was already moving, the initial velocity was
vi = 28.6 - 12 = 16.6 m/s
if the impulse was applied in the direction opposite of the original velocity, the initial velocity was
vi = 28.6 + 12 = 40.6 m/s
Other angles of Net force would result in various initial velocities.
Answer:
what is heat and transfer
1. The seven common neurotransmitters are:
GABA,
GLUTAMATE
ENDORPHIN
SEROTONIN
DOPAMINE
ACETYCHOLINE AND
NOREPINEPHRINE.
The three I will talk about are: GABA, glutamate and dopamine.
GABA: This neurotransmitter functions by inhibiting the firing of neurons.
Glutamate: It works by strengthening the synaptic connection between neurons.
Dopamine: It functions by regulating the area of the brain that is involved in controlling movement and the sense of pleasure.
2. GABA [Gamma Aminobutyric Acid] : The primary function of this neurotransmitter is to regulate and inhibit the neuroactivity of the neurons. The following functions are performed by GABA: It subdue anxiety. It plays a role in the female reproductive functions. It facilitates sound sleep. It is also involved in learning and memory.
Glutamate: It is the principal excitatory neurotransmitter of the central nervous system. It is involved in almost all aspects of normal functioning of the brain, such as learning, cognition, memory, etc.
Dopamine: This neurotransmitter functions in movement, memory, improve attention span and promotes feelings of pleasure.
1) The total mechanical energy of the rock is:
where U is the gravitational potential energy and K the kinetic energy.
Initially, the kinetic energy is zero (because the rock starts from rest, so its speed is zero), and the total mechanical energy of the rock is just gravitational potential energy. This is equal to
where
is the mass,
is the gravitational acceleration and
is the height.
Putting the numbers in, we find the potential energy
2) Just before hitting the ground, the potential energy U is zero (because now h=0), and all the potential energy of the rock converted into kinetic energy, which is equal to:
where v is the speed of the rock just before hitting the ground. Since the mechanical energy of the rock must be conserved, then the kinetic energy K before hitting the ground must be equal to the initial potential energy U of the rock:
3) For the work-energy theorem, the work W done by the gravitational force on the rock is equal to the variation of kinetic energy of the rock, which is:
Answer: First option
Explanation: The higher the frequency, the higher the energy.
λν=c where λ is the wavelength, ν is the frequency and c is the speed of light. So when wavelength decreases, v increases and so does energy.
An AM radio wave has a very long wavelength. It therefore has a very low frequency and low energy.
A light wave has a very short wavelength. It therefore has a high frequency and high energy.