PHYSICS HIGH SCHOOL

A 2 kg wagon is at rest on a sidewalk. How much gravitational force is acting on the wagon?

Answers

Answer 1
Answer: F = ma
m = 2
a = g = 9.81 (since it is gravitational force we use 9.81 m/s^2)

F = 2(9.81) = 19.62N
Answer 2
Answer: The answer is 19.62N!

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When there is no air resistance, objects of different masses dropped from rest?

Answers

Reach the ground at the same time

Imagine that you are working as a roller coaster designer. You want to build a record breaking coaster that goes 70.0 m/s at the bottom of the first hill. You estimate that the efficiency of the tracks and cars you are using 90.0%. How high must the first hill be?

Answers


Wow !  This is not simple.  At first, it looks like there's not enough information, because we don't know the mass of the cars.  But I"m pretty sure it turns out that we don't need to know it.

At the top of the first hill, the car's potential energy is

                                  PE = (mass) x (gravity) x (height) .

At the bottom, the car's kinetic energy is

                                 KE = (1/2) (mass) (speed²) .

You said that the car's speed is 70 m/s at the bottom of the hill,
and you also said that 10% of the energy will be lost on the way
down.  So now, here comes the big jump.  Put a comment under
my answer if you don't see where I got this equation:

                                   KE = 0.9  PE

        (1/2) (mass) (70 m/s)² = (0.9) (mass) (gravity) (height)     

Divide each side by (mass): 

               (0.5) (4900 m²/s²) = (0.9) (9.8 m/s²) (height)

(There goes the mass.  As long as the whole thing is 90% efficient,
the solution will be the same for any number of cars, loaded with
any number of passengers.)

Divide each side by (0.9):

               (0.5/0.9) (4900 m²/s²) = (9.8 m/s²) (height)

Divide each side by (9.8 m/s²):

               Height = (5/9)(4900 m²/s²) / (9.8 m/s²)

                          =  (5 x 4900 m²/s²) / (9 x 9.8 m/s²)

                          =  (24,500 / 88.2)  (m²/s²) / (m/s²)

                          =        277-7/9    meters
                                  (about 911 feet)

The velocity of the source is positive if the source is ______________. Note that this equation may not use the sign convention you are accustomed to. Think about the physical situation before answering.a. traveling in the +x direction
b. traveling toward the listener
c. traveling away from the listener

Answers

Answer: Answer is "B"

Explanation:

A physical situation of this question can be conceived as follows: If a siren is blowing through a certain distance in motion, then the listener find out that the velocity of the sound wave increases as the source of the siren is approaching the listener. The listener hear the maximum sound frequency and velocity of the source as it reaches him. However, the source velocity decreases as the siten moves away from the listener which can be said to be negative. Therefore, the correct answer is that the velocity increases as the source is moving towards the listener which is option "B"

Final answer:

In Physics, a positive velocity of a source usually indicates that the source is moving towards the observer or listener. This is based on the principles of the Doppler effect. The sign convention can change depending on the reference system

Explanation:

In the realm of Physics, particularly in the study of waves and sound, when we say that the velocity of the source is positive, it generally means that the source is traveling towards the listener. This is in line with the convention in Doppler effect, a phenomenon observed whenever the source of waves is moving with respect to the observer. Given this, the correct answer to your question would be (b) traveling toward the listener.

However, be mindful that the sign convention may vary depending on the context or the reference system being used. Still, the major principle remains: the perceived frequency is higher if the source is moving towards the observer, associated with a positive velocity; and lower if it's moving away, associated with a negative velocity.

Learn more about Velocity and Direction here:

brainly.com/question/1886551

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LACECHMI, CEIECTLR, IRITONCF, AREOGLHMET, LCRNEAU, and, ROASL, are all types of energy that can be converted into themal energy?LACECHMI, CEIECTLR,IRITONCF,AREOGLHMET, LCRNEAU, and, ROASL, (can you please help me)

Answers

chemical
electric
friction
geothermal
nuclear
solar

When it's winter in the United States, in Argentina it is _____.A. spring
B. summer
C. fall
D. also winter

Answers

Answer:

B. summer  

Explanation:

United States is in Northern hemisphere and Argentina is in southern hemisphere. Seasons occur on Earth due to the inclination of the axis of rotation. The hemisphere which faces towards sun has summer and the other would point away would have winter.

Thus, when United States would have Winter, it would be Summer in  Argentina.
It would be summer because the Southern Hemisphere's seasons are the opposites of the US'.

Once their strength is exceeded, rocks near the surface behave likeA. modeling clay.
B. most metals.
C. glass objects.
D. caramel candy.

Answers

The answer is Glass objects C. in this case.  
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