1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Elis [28]
3 years ago
9

A garage door opener has a power rating of 350 watts. If the door is in operation for 30 seconds, how many joules of energy are

used? (Hint: Remember that 1 watt = 1 joule/sec)
Physics
1 answer:
Ksju [112]3 years ago
7 0
Because of the hint we can conclude what equation we need to solve this problem. We have power and duration that means that we need to express energy:

1 joule = 1watt * 1 second
or
E (energy) = P (power) * t (time duration)
E = 350 * 30 = 10500 joules.
You might be interested in
An apple falls from an apple tree growing on a 20° slope. The apple hits the ground with an impact velocity of 16.2 m/s straight
EleoNora [17]

Apple hits the surface with speed 16.2 m/s

The angle made by the apple velocity with normal to the incline surface is given as 20 degree

now the component of velocity which is parallel to the surface and perpendicular to the surface is given as

v_{perpendicular} = v cos20

v_{parallel} = v sin20

so here we have

v_{parallel} = 16.2 sin20

v_{parallel} = 5.5 m/s

<em>so its velocity along the incline plane will be 5.5 m/s</em>

7 0
3 years ago
As a person squeezes and applies pressure to the outside of a balloon air particles inside
MAVERICK [17]
They will occupy less volume which will cause an increased density of the particles.
3 0
3 years ago
The apparent weight of a student in alift is 564N . if the mass of the student is 60.3kg, what is the acceleration of the lift ?
Yuki888 [10]

Answer:

-.457 m/s^2

Explanation:

Actual weight =   60 .3 (9.81) = 591.54 N

Accel of lift changes this to    60.3 ( 9.81 - L)     where L - accel of lift

                                           60.3 ( 9.81 - L ) = 564

                                               solve for L = .457 m/s^2  DOWNWARD

                                                        so L = - .457 m/s^2

4 0
2 years ago
How do you un rewrap something?
MAVERICK [17]
Wrap it back up……….
7 0
2 years ago
What may have been the first step in the formation of the solar system?
CaHeK987 [17]
Milky way galaxy / stars
7 0
3 years ago
Other questions:
  • Given a particle that has the velocity v(t) = 3 cos(mt) = 3 cos (0.5t) meters, a. Find the acceleration at 3 seconds. b. Find th
    9·1 answer
  • Victoria has a crate of vegetables that weighs 100 newtons. She exerts a force of 100 newtons to lift the crate with a pulley. W
    9·2 answers
  • Identify the parts of the wave below. Please help! I need it quite soon!
    14·1 answer
  • A 4.88 x 10-6 C charge moves 265 m/s
    7·2 answers
  • You are reviewing your results from an experiment involving a soccer ball being kicked. You claimed that, "unbalanced
    5·1 answer
  • 1. A wave with a frequency of 10 Hz has a wavelength of 3 meters. At what
    14·1 answer
  • A weight lifter lifts a dumbbell a certain height in 2.0 s, while a competitor does the same workin 1.0 s. Compared to the power
    10·1 answer
  • There is a current of 0.83 A through a lightbulb in a 120 V circuit. What is the resistance of this lightbulb?
    5·1 answer
  • It is easier to roll a stone up a sloping road than to lift it vertical upwards because.
    5·1 answer
  • If the average density of the Universe is small compared with the critical density, the expansion of the Universe described by H
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!