All categories

3 years ago

How much work does a motor do as it lifts a 675-kilogram elevator from a height of 15 meters to a height of 35 meters?

1 answer:

3 0

Work is defined as Force x Distance

W = Fd

so (675kg)(9.8m/s^2) = 6615 N

d = 35-15 = 20m

so

W = Fd
(6615N)(20m)

132,300 J = W

You might be interested in

What does K stand for in Hookes law?

wlad13 [49]

So Hooke's law says that that law is proportional to how much I stretch the spring. Alright. So f=kx. x is the length of the spring now minus its length when it's relaxed and nobody's pulling on it. k is a constant called the spring constant.

3 0

3 years ago

Read 2 more answers

A manufacturer of printed circuit boards has a design capacity of 1,000 boards per day. the effective capacity, however, is 700

Alekssandra [29.7K]

A manufacturer of printed circuit boards has a design capacity of 1,000 boards per day. the effective capacity, however, is 700 boards per day. recently the production facility has been producing 950 boards per day. The design capacity utilization is (950/100) *100 = 95 %

3 0

3 years ago

The temperature dependence of classical expression for electrical resistivity is

Gemiola [76]

Answer:

The resistivity of materials depends on the temperature as ρt = ρ0 [1 + α (T – T0). This is the equation that shows the relationship between the resistivity and the temperature.

hope it helps

5 0

3 years ago

13. How many electrons does a complete third electron shell hold?

ale4655 [162]

Answer:

A) 8

A complete third electron shell holds 8 electrons

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

hope it helps...

have a great day!!

6 0

3 years ago

The radius of Earth is about 6450 km. A 7070 N spacecraft travels away from Earth. What is the weight of the spacecraft at a hei

Triss [41]

Answer:

(a) 1767.43 N

(b) 182.45 N

Explanation:

Radius of earth, R = 6450 km

Weight of person, W = 7070 N

mass of person, m = W / g = 7070 / 9.8 = 721.4 kg

(a) h = 6450 km

The value of acceleration due to gravity on height is given by

$g' = g\left ( \frac{R}{R+h} \right )^2$

$g' = g\left ( \frac{6450}{6450+6450} \right )^2$

g' = g / 4 = 9.8 / 4 = 2.45 m/s^2

The weight of the person at such height is

W' = m x g' = 721.4 x 2.45

W' = 1767.43 N

(b) h = 33700 km

The value of acceleration due to gravity on height is given by

$g' = g\left ( \frac{R}{R+h} \right )^2$

$g' = g\left ( \frac{6450}{6450+33700} \right )^2$

g' = g x 0.0258 = 9.8 x 0.0258 = 0.253 m/s^2

The weight of the person at such height is

W' = m x g'

W' = 721.4 x 0.253

W' = 182.45 N

3 0

3 years ago