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3 years ago

You are going to invent a new device that people can use instead of a microwave to warm up leftovers.

Physics

1 answer:

agasfer [191]3 years ago

8 0

OK. I would build it the same shape and size as a microwave oven, but I would leave out all the normal electronics.

In the side compartment, in place of the electronics, at the top, I would put a little gas flame, like a Bunsen burner. In the bottom of the side compartment, I would put a treadmill with two strong hamsters. Then, I would install ductwork in the compartment so that when the hamsters turn the wheel, some fan-blades along the rim of the wheel would blow the hot air from the gas flame down and into the big food compartment. This would warm the left-overs WITHOUT using electricity from the wall outlet, and without spraying any hazardous high-power RF energy into the kitchen.

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State any ten reasons why students in Uganda need to study physics?use examples of the possible technological advancements which

fenix001 [56]

Answer:

1.it also hleps us to became doctors becuase without physics you can't be a doctor

2.physics needs to be steady whether you like it or not it helps you in life so everybody must study physics no matter is in Uganda USA and plenty more countries there must be physics to dare to be studied

8 0

3 years ago

Explain why water boiling in a container stops<br>boiling momentarily when the lid is removed

Dmitriy789 [7]

Answer:

It's because it tips over the threshold from nucleate boiling, which we can see, to convection boiling, which we can't. ... Even if the steam stayed in the pot, it would still stop boiling when you removed the heat. The steam and water in a liquid/vapour mixture are at the same temperature (100ºC).

Explanation:

8 0

4 years ago

Which best describes the characteristics of a river basin

kicyunya [14]

River basin characteristics:

- tributaries
- area of land
- precipitation collects
- water drainage
- flowing water

Hope I helped. Please vote my answer branliest! Thanks.

7 0

4 years ago

Read 2 more answers

What is the function of the commutator in a DC motor? A. to spin the magnet B. to change direct current into alternating current

sergejj [24]

Answer

Correct Answer is B(to change direct current into alternating current)

Explanation

commutation

The main aim of commutation is to maintain the torque acting on armature of DC motros in the same direction.

commutator a switch which is used to convert the direction of flow of electric current it is connected to the armature of DC motor.

In DC motors, voltage across the armature is alternating in nature. The direction of this current is reverses by Commutator when armature of DC motors passes through magnetic neutral axis to maintain the unidirectional. Hence, commutator is used to change direct current into alternating current.

6 0

3 years ago

A 94.0 N grocery cart is pushed 17.6 m along an aisle by a shopper who exerts a constant horizontal force of 42.6 N. The acceler

Vadim26 [7]

Answer:

vf = 12.51 m/s

Explanation:

Newton's second law to the grocery cart:

∑F = m*a Formula (1)

∑F : algebraic sum of the forces in Newton (N)

m : mass s (kg)

a : acceleration (m/s²)

We define the x-axis in the direction parallel to the movement of the grocery cart and the y-axis in the direction perpendicular to it.

Forces acting on the grocery cart

W: Weight of the block : In vertical direction downward

N : Normal force : In vertical direction upward

F : horizontal force

Calculated of the mas of the grocery cart (m)

W = m*g

m = W/g

W = 94.0 N , g = 9.81 m/s²

m = 94/9.81

m = 9.58 Kg

Calculated of the acceleration of the grocery cart (a)

∑F = m*a

F = m*a

42.6 = (9.58)*a

a = (42.6) / (9.58)

a = 4.45 m/s²

Kinematics Equation of the grocery cart

Because the grocery cart moves with uniformly accelerated movement we apply the following formula to calculate its final speed :

vf²=v₀²+2*a*d Formula (2)

Where:

d:displacement (m)

v₀: initial speed (m/s)

vf: final speed (m/s)

a: acceleration (m/s²)

Data:

v₀ = 0

a = 4.45 m/s²

d = 17.6 m

We replace data in the formula (2) :

vf²=v₀²+2*a*d

vf² = 0+2*(4.45)*(17.6)

vf² = 156.64

$v_{f} = \sqrt{156.64}$

vf = 12.51 m/s

7 0

4 years ago