PHYSICS HIGH SCHOOL

Natalia lifts a bag of groceries 0.50 m by exerting a force of 36 N. How much work did she do on the bag?

Answers

Answer 1
Answer:

Answer;

18 Joules

Explanation;

  • Work is the measures the transfer of energy when an object moves over a given distance.
  • Work is therefore given by; Force × distance

Force =36 Newtons

Distance = 0.5 meters

  • Hence; work = 36 N × 0.5 N

                               = 18 Joules

Answer 2
Answer:

the answer is 18 joules hope this helps

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you lift a 30 N crate 2 meters onto a shelf. it takes you 5 seconds to accomplish this. how much gravitional potential energy does the crate gain

Answers

Gravitational potential energy is equal to force times height. That's 30 x 2 = 60 Joules. It makes no difference how fast or how slow you do the lift.

The energy released from the sun is the result of a nuclear fission reaction?

Answers

The statement is false because the energy released from the sun is the result of a nuclear fusion reaction. This type of nuclear reaction involves the fusing of two hydrogen nuclei to form a heavier helium atom. The energy involved here is much greater than nuclear fission, and involves higher temperature.

Answer:

false

Explanation:

my brain is always correct

A tank with a flat bottom is filled with water to a height of 4 meters. What is the pressure at any point at the bottom of the tank? (You can ignore atmospheric pressure when calculating your answer.)A. 18.9 kPa
B. 9.8 kPa
C.39.2 kPa
D. 4.0 kPa

Answers

Answer

C.39.2 kPa


Explanation

The pressure in liquids depend on the depth or what we call the liquid column(h), the density of the liquid(σ) and the the acceleration due to gravity(g).

h = 4.00 m

σ = 1000 Kg/m³

g = 9.8m/s²


Pressure Is given by;

P = σgh

= 1000 × 9.8 × 4

= 39200 Pa

=39.2 KPa
P=pgh, remeber that g=9.8 , so ignoring the atmosheric pressure youwould just multiply 9.8x4 and you would get 39.2KPa

A car travels 15 kilometers west in 10 minutes. After reaching the destination, the car travels back to the starting point, again taking 5 minutes. What is the average velocity of the car?A. 0 meters/seconds
B. 1.0 meters/seconds
C. 1.5 meters/seconds
D. 2.0 meters/seconds

Answers


Speed = (distance traveled) / (time to travel the distance).
 
Strange as it may seem, 'velocity' is completely different. 

Velocity doesn't involve the total distance traveled at all. 
Instead, 'velocity' is based on 'displacement' ... the distance
between the start-point and end-point, regardless of the route
taken to get there.  So the displacement in driving once around
any closed path is zero, because you end up where you started. 

Velocity =

           (displacement during some time)
divided by
            (time for the displacement)

AND the direction from the start-point to the end-point.


For the guy who drove 15 km to his destination in 10 min, and then
back to his starting point in 5 min, (assuming he returned by way of
the same 15-km route):

         Speed = (15km + 15km) / (10min + 5min)  =  (30/15) (km/min)

                                                                                 =  2 km/min.

        Velocity = (end location - start position) / (15 min)  =  Zero .

What is the application for reflection of waves?

Answers

One big application is the manufacture and use of mirrors.

Could a vector ever be shorter than one of its components? Equal in length to one of its components? Explain.

Answers

It can never be shorter than a component - magnitude of a vector is the square root of the sum of the components squared, and a square function never produces a negative number. However, it can be the same size as it's component, if that component is the only one.

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Explanation:
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