If 56.5kJ are needed to raise the temp by 90°C and if the heater is 60% efficient that means that:
60% X y = 56.5kJ
where y is the electrical energy in kJ that the heater will use.
y = 94.2kJ

6 0

2 years ago

What was the first manmade satellite put into orbit

Nataly_w [17]

The Soviet Union's Sputnik 1, it was launched October 4th 1957.

5 0

3 years ago

What is the change in potential energy with respect to the ground of a 0.55 g son of a leech (a very effective fly for steelhead

IceJOKER [234]

Answer:

We will use Potential Energy Formula

Potential Energy = mass × gravitation × height

PE = 0,55 × 10 × 4

PE = 22 J (A)

5 0

2 years ago

A stunt-rider on a motorcycle rides down a ramp and into a vertical loop-the-loop. If the diameter of the loop is 7.50 m, then t

VikaD [51]

Answer:

v = 6.06 m/s

Explanation:

In order for the rider to pass the top of the loop without falling, his weight must be equal to the centripetal force:

$Centripetal Force = Weight \\\frac{mv^2}{r} = mg\\\\\frac{v^2}{r} = g\\\\v = \sqrt{gr}$

where,

v = minimum speed of motorcycle at top of the loop = ?

g = acceleration due to gravity = 9.8 m/s²

r = radius of the loop = diameter/2 = 7.5 m/2 = 3.75 m

Therefore, using these values in equation, we get:

$v = \sqrt{(9.8\ m/s^2)(3.75\ m)}$

5 0

2 years ago