a 5kg mass resting on a smooth horizontal, frictionless table is connected to a cable which passes over a pulley and then is fastened to a hanging 10kg mass. find the acceleration of the two objects and the tension of the string.

Answers

Answer 1
Answer: T= 5a

 -T +10g = 10a

-15a =10g

a=-10g/15

a= -1/2 g
Negative a means block is accelerating downwards.

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Which statement best describes the superposition principle?A. If two in-phase waves arrive simultaneously at a point, their amplitudes add up. B. If two out-of-phase waves arrive simultaneously at a point, their amplitudes add up. C. If two in-phase waves arrive at a point one after another, their amplitudes add up. D. If two out-of-phase waves arrive at a point one after the other, their amplitudes adds up

The psychologist who worked with Peter and helped him associate rabbits with positive things was: a. Mary Covert-Jones
b. Ivan Pavlov
c. Elizabeth Loftus
d. John Watson

Knowing the formula for water and table salt is an example of:_________________memory.
a. episodic
b. procedural
c. semantic
d. echoic

The part of the brain that appears to be involved in the processing of short-term memories into long term is the:
a. hypothalamus
b. hippocampus
c. corpus callosum
d. cerebrum

Answers

1. Mary Cover-Jones 

2.Knowing the formula for water and table salt is an example of episodic memory.    so d

3.Hippocampus


Answer:

1) Mary Cover-Jones

2) episodic

3) hippocampus

Hope this helped man!

If you squeeze the bottom of a closed tube of toothpaste, the pressure is increased ____.

Answers

The cap will pop of,THE SEAL WILL BREAK, or the tube will explode.
The cap will pop off and it may fly or hurt somebody.

If an object is NOT accelerating, then one knows for sure that it is ___.A. at rest
B. moving with a constant speed
C. slowing down
D. maintaining a constant velocity

Answers


"Zero acceleration" means "velocity" that's not changing.

Sadly, it seems that both of these words are almost always
misinterpreted and misunderstood. "Acceleration" does NOT
mean "speeding up", and "velocity" does NOT mean speed.

"Velocity" is the speed AND direction of motion.  So, for example,
'30 miles per hour north' and '30 miles per hour west' are the same
speed but different velocities.

"Acceleration" is ANY change in speed OR direction.  Consider three
different families in three different cars.  One car is speeding up, one is
slowing down, and the third is driving around a curve at a steady speed.
ALL three of the cars are accelerating.

Answer:

Zero acceleration means velocity that's not changing.

Explanation:

A 400 kg object is sitting at rest at the top of a hill that is 30.0m high and 80.0m long measured along the hill . If there is no friction ,how fast will the object be going at the bottom of the hill?

Answers

The object be going at the bottom of the hill with velocity 7.75 m/s.

What is velocity?

When an item is moving, its velocity is the rate at which its direction is changing as seen from a certain point of view and as measured by a specific unit of time.

Given in the question a  400 kg object is sitting at rest at the top of a hill that is 30.0 m high and 80.0 m long measured along the hill . If there is no friction, velocity with which object be going at the bottom of the hill,

θ =sin^-1(30/80)

θ =22

F = 400 g sin(22) = 150 N

F = ma

150 = 400 a

a = 0.375 m/s²

v² - u²= 2 a s

v² - 0 = 2 x 0.375 x 80

v = 7.75 m/s

The object be going at the bottom of the hill with velocity 7.75 m/s.

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theater=sin^-1(30/80)
theater=22
F=400gsin22=150N
F=ma
150=400a
a=0.375ms^-2
v^2-u^2=2as
v^2-0=2x0.375x80
v=7.75ms^-1

The Greeks rejected the notion that the Earth orbits the Sun. Why? A.) They believed that the Sun is a God.B.) They weren't as smart as we are.
C.) They could not measure a change in stars' positions on the sky.
D.) They could not measure how big the Earth was.

Answers

B.) It ran contrary to their senses. Greeks knew that we should see stellar parallax if we orbited the Sun – but they could not detect it.

A chunk of aluminum at 91.4°C was added to 200.0 g of water at 15.5°C. The specific heat of aluminum is 0.897 J/g°C, and the specific heat of water is 4.18 J/g°C. When the temperature stabilized, the temperature of the mixture was 18.9°C. Assuming no heat was lost to the surroundings, what was the mass of aluminum added?

Answers

Final answer:

The mass of the aluminum added is calculated through the principle of conservation of energy, specifically thermal energy. By considering the heat lost by the aluminum and gained by the water, we can rearrange the equation for heat transfer and find that the mass of the aluminum is approximately 37.9 grams.

Explanation:

In this physics question, we're looking at a thermodynamic process involving a chunk of aluminum and water. Given the known values of their respective specific heats, the mass of water, and their final equilibrium temperature, we're aiming to find the mass of the aluminum.

We begin by understanding that in a closed system, the heat gained by one body is equal to the heat lost by another. In this case, the aluminum is losing heat, and the water is gaining it. The equation for heat transfer (Q = mcΔT), where m is mass, c is specific heat, and ΔT is change in temperature.

The heat gained by the water = mass of water * specific heat of water * change of temperature in water = 200g * 4.18J/g°C * (18.9°C - 15.5°C) = 2836.4J.

This is equal to the heat lost by the aluminum. Solving the analogous heat equation for the mass of the aluminum gives us the answer:

m = Q / (c * ΔT) = 2836.4J / (0.897J/g°C * (91.4°C - 18.9°C)) = 37.9g

So the mass of the aluminum is approximately 37.9 grams.

Learn more about Thermodynamics here:

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