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3 years ago

A mover loads a 100 kg box into the back of a moving truck by

Physics

1 answer:

NeX [460]3 years ago

3 0

Answer:

2.7

Explanation:

The following data were obtained from the question:

Mass (m) of box = 100 Kg

Length (L) of ramp = 4 m

Height (H) of ramp = 1.5 m

Mechanical advantage (MA) of ramp =?

Mechanical advantage of a ramp is simply defined as the ratio of the length of the ramp to the height of the ramp. Mathematically, it is given by:

Mechanical Advantage = Lenght / height

MA= L/H

With the above formula, we can obtain the mechanical advantage of the ramp as follow:

Length (L) of ramp = 4 m

Height (H) of ramp = 1.5 m

Mechanical advantage (MA) of ramp =?

MA = 4/1.5

MA = 2.7

Therefore, the mechanical advantage of the ramp is 2.7

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A solenoid 10.0 cm in diameter and 63.3 cm long is made from copper wire of diameter 0.100 cm, with very thin insulation. The wi

aliina [53]

Answer:

19559303watts

Explanation:

The field inside a solenoid is

B =µ0*N*I/h

where N is the number of turns, I the current in each turn, and h the length.

If the wire's diameter is d, then the number of turns is N = h/d so the equation becomes

B = µ0*I/d

I = B*d/µ0

B = 7.8*10^-3 T, d = 0.001 m, µ0 = 4*π*10^-7 H/m

I = 8*10^-3*0.001/(4*π*10^-17))

I = 6.366A

For power

We need to know ρ, the resistivity of the wire. The resistance of the coil R = ρ*L/A where L is the total wire length and A the area.

L = N*π*D, were D = diameter of the solenoid and N the no of turns. As above, N = h/d so L = h*π*D/d. The wire area is π*d²/4 so the resistance is

R = ρ*h*π*D/d*(π*d²/4) = 4*ρ*h*D/d³

The power is I²*R = (B*d/µ0)²*4*ρ*h*D/d³ = (B/µ0)²*4*ρ*h*D/d

For copper ρ = 16.8*10^-9 Ω-m and

D = 0.10 m, h = 0.722 m

P = (6.366 / 4 * π * 10^-7)^2 * 4 * 16.8 * 10 ^-9 * 0.722 * 0.1/0.001

P = 19559303watts

P = 20MW

7 0

4 years ago

Read 2 more answers

Match the following items. 1. empathy a personal view of a situation; ability to understand the senses 2. perception mental heal

Salsk061 [2.6K]

Answer:

perception - A personal view of a situation...

Psychiatrist - mental health professional...

Clinical - concerned with the treatment of disease...

cognition - a person's ability to think.

empathy - Identifying someone's situation...

humanism - a person should be considered as a whole...

Educational psychologist - concerned with the way humans learn ...

Explanation:

1. Perception is the ability to interpret and understand what we sense through our different senses. In other words, it is the ability to understand what is going on in our environment through sight, sound, touch, and the like.

2. A psychiatrist is a medical doctor that deals with the treatment, prevention, and diagnosis of metal disorders. They can also treat patience through medication because they are allowed to prescribe medicines.

3. Clinical medicine involves the actual treatment of patients. You can think of it as the actual practice of medicine, and not theoretical and not just work in laboratories.

4. Cognition is a mental process that not only involves thinking, but also comprehension. It involves acquiring knowledge through experience and observation.

5. Empathy is the ability to understand how someone else is feeling in a particular situation. There's a saying, "Putting yourselves in other's shoes." This means to understand how it feels to be in that situation, which is also known as the act of empathizing.

6. Humanism, as the name suggests is HUMAN-centered. This means that one is considered not only by what others see but what the person sees as well. It is concerned with everything that has to do with that person both externally and internally.

7. Educational psychologist deals with children and school specifically. They assess how humans learn, how they think and how they behave in the school setting. They also do councelling for students, parents, teachers, and other people involved in the educational communities.

8 0

3 years ago

Your cool down session should include

hodyreva [135]

I don't understand the question

8 0

4 years ago

An aluminum wire with a diameter of 0.115 mm has a uniform electric field of 0.235 V/m imposed along its entire length. The temp

Aleonysh [2.5K]

Answer:

Explanation:

a) To get the resistivity ρ at 50 Celsius, given the resitstivity at 20 Celsisus, use:

ρ = ρo(1 + α(T - To))

where To = 20 Celsius

b) Knowing the resistivity at 50 Celsius, and the (uniform) electric field E, you can determine the current density J using:

E = ρJ

(which is actually a density-averaged version of V = IR)

c) Assuming the current is uniform (which is should be in a uniform electric field and constant-diameter wire), the current i can be calculated using:

J = i/A --> i = JA

where A is the cross-sectional area of the wire (given by πr2); make sure to convert the given diameter to a radius, and the radius to base units

d) Since the electric field is given in volts per meter, and you have two meters of length in the wire, you can determine directly from that how many volts difference you need at the ends of the wire to get 0.2 volts per meter.

0.2 = V/d

with d = 2 m. This corresponds to a uniform electric field being related to voltage by V = Ed, where d is distance along the field line.

6 0

4 years ago

Read 2 more answers

A ball is thrown straight upward and rises to a maximum height of 18.0 m above its launch point. at what height above its launch

slava [35]

A ball is thrown straight upward and rises to a maximum height of 18.0 m

above its launch point. at what height above its launch point has the

speed of the ball decreased to one-half of its initial value?

-----------------------

kinematic equation

v^2=u^2-2as; v0=,s=18,a=-10m/s/s

u=root 360

(u/2)^2=u^2-2as

=>s=13.5m

5 0

4 years ago