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2 years ago

A 2400W electric toaster is connected to a standard 120 V wall outlet. A family

Physics

1 answer:

jolli1 [7]2 years ago

5 0

Answer:

1) energy = 15.6 kWh, 2) total_cost = $ 2.03

Explanation:

1) The energy dissipated is the product of the power and the time of use In a month it was used t = 6.5 h and the power of the toaster is

P = 2400 W = 2,400 kW

energy = P t

energy = 2,400 6.5

energy = 15.6 kWh

using rounding to a decimal

energy = 15.6 kWh

2) The cost of energy is unit_cost = $ 0.13 / kWh

so the total cost

total_cost = energy unit_cost

total_cost = 15.6 0.13

total_cost = $ 2.028

rounding to two decimal places

total_cost = $ 2.03

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3 years ago

An object moves with constant acceleration 4.05 m/s2 and over a time interval reaches a final velocity of 11.2 m/s.

aleksandrvk [35]

a) Displacement: 11.6 m

b) Distance: 11.6 m

c) Displacement: 11.6 m

d) Distance: 19.4 m

Explanation:

The motion of the object is a uniformly accelerated motion, so we can use the following suvat equation to find the displacement:

$v^2-u^2=2as$

where

s is the displacement

u is the initial velocity

a is the acceleration

v is the final velocity

For the object in this problem,

u = 5.60 m/s

v = 11.2 m/s

$a=4.05 m/s^2$

Solving for s, we find the displacement:

$s=\frac{v^2-u^2}{2a}=\frac{11.2^2-5.60^2}{2(4.05)}=11.6 m$

Since the motion of the object is in a straight line and the direction of the velocity does not change, the distance is equal to the displacement, therefore

d = 11.6 m

We can find the displacement of the object in this case by using again the equation

$v^2-u^2=2as$

where

s is the displacement

u is the initial velocity

a is the acceleration

v is the final velocity

This time, we have:

u = -5.60 m/s

v = 11.2 m/s

$a=4.05 m/s^2$

Solving for s, we find the displacement:

$s=\frac{v^2-u^2}{2a}=\frac{11.2^2-(-5.60)^2}{2(4.05)}=11.6 m$

In this case, the velocity of the object changes direction: this means that for part of the trip the object moves in the negative direction, and for part of the trip it moves in the positive direction. Therefore, the distance is not equal to the displacement.

In order to find the distance, we have to calculate first the distance covered when the object is moving in the negative direction; so, from when it has velocity of

u = -5.60 m/s

to when it has a velocity of

v = 0

Therefore,

$d_1=\frac{v^2-u^2}{2a}=\frac{0-(-5.60)^2}{2(4.05)}=3.9 m$