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Lynna [10]
3 years ago
5

An automobile engine has an efficiency of 19.0%. If it produces 23.0 kJ of mechanical work per second, the heat rejected per sec

ond from the engine is closest to: (a) 77.0 kJ (b) 81.5 kJ (c)86.5 kJ (d) 92.0 kJ (e) 98.1 kJ
Physics
1 answer:
creativ13 [48]3 years ago
5 0

Answer:

(e) 98,1 KJ

Explanation:

The engine produces 19%; it means, it rejects 81% of energy. ⇒ 81/19=4.26 times.

The engine produces 23 kJ; it means it rejects 23 * 4.26 = 98.05263 kJ

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Use Newton's method with the specified initial approximation x1 to find x3, the third approximation to the root of the given equ
sdas [7]

Answer:

x_{3}=2.35

Explanation:

Given x^2-2x-1=0,x_1=2

From Newton's method

x_{n+1}=x_n-\dfrac{f(x_n)}{f'(x_n)}

f(x)=x^2-2x-1

f'(x)=2x-2

Now

x_{2}=x_1-\dfrac{f(x_1)}{f'(x_1)}

f(x)=x^2-2x-1

f(2)=2^2-2\times 2-1

f(x)=-1

f'(2)=2x-2

f'(1)=2\times 2-2

f'(1)=2

x_{2}=2+\dfrac{1}{2}

x_{2}=2.5

x_{3}=x_2-\dfrac{f(x_2)}{f'(x_2)}

f(2.5)=2.5^2-2\times 2.5-1

f(2.5)=0.45

f'(2.5)=2\times 2.5-2

f'(2.5)=3

x_{3}=2.5-\dfrac{0.45}{3}

So

x_{3}=2.35

8 0
3 years ago
What is the mass in kg of a leopard in a tree if the tree branch is 36 m up and the leopard's gravitational potential energy is
ElenaW [278]

Answer:

83.3kg

Explanation:

GPE = m × g × h

GPE = mass of leopard × 10 × 36m

29988J = 360 × mass

mass = 83.3kg

5 0
3 years ago
A particular roller coaster has a mass of 3500 kg, a height of 4.0 m, and a velocity of 12 m/s. What is the kinetic energy? If n
Alenkinab [10]

Explanation:

given

m=3500kg,h=4.0m,v=12m/s

ke=½mv²

½×3500×12²=3500×144÷2

=252,000j or 252j

8 0
2 years ago
What is the correct formula for of the weight w of an object? assume that its mass is m, the magnitude of its acceleration is a,
Vsevolod [243]
Weight = Mass × Acceleration
6 0
3 years ago
Read 2 more answers
A mover loads a crate onto a truck bed 1.6m from the street using a ramp that is 4.6m long. What is a mechanical advantage?
Ne4ueva [31]

Answer:

Mechanical advantage = 2.875

Explanation:

Given:

A diagram is shown below for the above scenario.

Length of ramp (Effort arm) = 4.6 m

Height of truck bed ( Resistance length) = 1.6 m

Mechanical advantage (MA) is the ratio of effort arm and resistance length.

So, mechanical advantage is given as,

MA=\frac{\textrm{Effort arm}}{\textrm{Resistance length}}= \frac{4.6}{1.6}=2.875

6 0
3 years ago
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