PHYSICS
HIGH SCHOOL

A) 99 watts

B) 406 watts

C) 4,830 watts

D) 24,348 watts

a little help please and thank you best answer gets brainly

Answer: Power is the work performed divided by time in seconds. The work is the force times distance:

the time in seconds is 60*11+30=690s so the power is

So choice B

the time in seconds is 60*11+30=690s so the power is

So choice B

MIDDLE SCHOOL

If a car drove 121km/hr on average how far did it travel in 116min?

Answer:

Explanation:

you would go a lil less then 240km

HIGH SCHOOL

A 220 g block is attached to a horizontal spring and executes simple harmonic motion with a period of 0.150 s. If the total energy of the system is 1.50 J, find the following(a) the force constant of the spring(b) the amplitude of the motion.

Answer:

a)K=385.86 N/m

b)A=0.088 m

Explanation:

Given that

m = 220 gm = 0.22 kg

t= 0.15 s

Total energy TE= 1.5 J

We know that time period in the SHM given as

ω=41.88 rad/s

We know that

ω² m = K

K=Spring constant

K=385.86 N/m

A=Amplitude

A=0.088 m

MIDDLE SCHOOL

Give a causes and effects of energy shortage. anyone? pls?☺

Causes-

Overconsumption of energy

Mass production of energy

Using mass amounts of fossil fuels

Effects-

Decrease in energy usage

More production in renewable energy sources

Decrease in production of fossil fuels

Overconsumption of energy

Mass production of energy

Using mass amounts of fossil fuels

Effects-

Decrease in energy usage

More production in renewable energy sources

Decrease in production of fossil fuels

HIGH SCHOOL

which best explains how thermal energy is transferred when someone holds a hand above a fire? a.it is being transferred by radiation because the hand is not in the path of rising air. b.it is not transferred by radiation because the hand is not in the path of rising air. c.it is being transferred by radiation because the hand is in the path of rising air. d.it is not transferred by radiation because the hand is in the path of rising air.

The answer is D. When one places a hand over a fire, they feel the heat mainly because of heat transfer by convection. This occurs when hot rising air, heated by the fire, reaches your hand. Cold air shift downwards to replace the hot rising air and the cycle continues. Nonetheless, radiation also contributes some part to the heat transfer but especially when you place your hands to the side of the fire.

Answer:

D) It is not transferred by radiation because the hand is in the path of rising air.

Explanation:

HIGH SCHOOL

A lumberjack is chopping wood with an ax. How does the ax make the lumberjack's job easier? A. The ax is heavy so it can split wood more easily. B. The ax multiplies the amount of work that is applied by the lumberjack. C. The ax multiplies the amount of force that is applied to the wood. D. The ax reacts with the wood so that it can be split more easily.

Answer: B

Explanation:

A machine multiplies the work output of a something by some amount. In this question, the ax is the machine. Thus, the ax is multiplying the work outputted by the lumberjack, so the answer is B. The reason it is not C is because there could be other forces interacting on the wood which the ax can affect.

Answer:

its C

Explanation:

COLLEGE

A record of travel along a straight path is as follows: 1. Start from rest with constant acceleration of 2.45 m/s^2 for 20.0 s. 2. Maintain a constant velocity for the next 1.60 min. 3. Apply a constant negative acceleration of −9.00 m/s^2 for 5.44 s. (a) What was the total displacement for the trip? _______m (b) What were the average speeds for

legs 1____m/s

Leg 2____m/s

Leg 3_____m/s

complete trip_______m/s

Answer:

a) The total displacement of the trip was 5.32 × 10³ m

b) The average speeds were:

leg 1: 24.5 m/s

leg 2: 49 m/s

leg 3: 23.9 m/s

Complete trip: 43.8 m/s

Explanation:

The position and velocity equations for an object moving along a straight line are as follows:

x = x0 + v0 · t + 1/2 · a · t²

v = v0 + a · t

Where

x = position at time t

x0 = initial position

v0 = initial velocity

t = time

a = acceleration

v = velocity at time t

If the velocity is constant, then a = 0 and x = x0 + v · t where "v" is the velocity.

a) To calculate the total displacement of the trip, let´s calculate the distance traveled in each phase.

Phase 1:

x = x0 + v0 · t + 1/2 · a · t²

x = 0 m + 0 m/s · t + 1/2 · 2.45 m/s² · (20.0 s)²

x = 490 m

The velocity reached in that phase is:

v = v0 + a · t

v = 0 m/s + 2.45 m/s² · 20.0 s

v = 49.0 m/s

Phase 2:

x = x0 + v · t

x = 490 m + 49.0 m/s · 96.0 s

x = 5.19 × 10³ m

Phase 3:

x = x0 + v0 · t + 1/2 · a · t²

x = 5.19 × 10³ m + 49 m/s · 5.44 s - 1/2 · 9.00 m/s² · (5.44 s)²

x = 5.32 × 10³ m

The total displacement of the trip was 5.32 × 10³ m

b) The average speed is calculated as the traveled distance divided by the elapsed time:

average speed v = final position - initial position / (final time- initial time)

Phase 1:

v = 490 m - 0 m / 20.0 s = 24.5 m/s

Phase 2:

v = 5.19 × 10³ m - 490 / 96.0 s

v = 48.9 m/s (without rounding the final position the result is 49.0 m/s)

Phase 3:

v = 5.32 × 10³ m - 5.19 × 10³ m / 5.44 s = 23.9 m/s

For the complete trip:

v = 5.32 × 10³ m - 0 m / (20.0 s + 96.0 s + 5.44 s)

v = 43.8 m/s

HIGH SCHOOL

This theory suggests that for every big bang, there is a big crunch. oscillating universe theory

inflation theory

steady state theory

big bang theory

Answer: oscillating universe theory

Explanation:

- The oscillating universe theory is a modification of the famous big bang theory.
- According to this theory, there are successive cycles of expansion and contraction that occurs in the universe and due to the contraction, the universe gets confined into a very small volume which has a large density.
- When the universe gets confined in such a way then, it is said that a 'bounce' will occur and, it would thus oscillate between the big bang and the big crunch.
- Thus, this theory states that for every big bang there is a big crunch.

HIGH SCHOOL

Lara has noticed that all of her friends are very careful about what they eat, and they are all much thinner than she is. She wants to be healthy, but she really wants to fit in with her friends. What is the best step for Lara to take? A. Talk to a trusted adult to help her evaluate her eating and exercise in a healthy way.

B.Ask her friends how they stay so thin, and use the same strategies.

C. Find new friends who are not as thin so she doesn't feel any pressure.

D.Try out the newest diet she's seen advertised on TV to help her lose the weight she wants to lose.

Answer: Option (A) is the correct answer.

Explanation:

If Lara wants to be healthy, and really wants to fit in with her friends then she should talk to a trusted adult to help her evaluate her eating and exercise in a healthy way.

This is because a trusted person will give her beneficial advice as compared to any other person or any advertisement on TV which may promise false results in order to sell their product.

This may also lead to harmful effects on her health. Thus, she should eat and exercise in a healthy way.

A. Talk to a trusted adult to help her evaluate her eating and exercise in a healthy way.

HIGH SCHOOL

NEED HELP FAST !!!!! What type of motion occurs when an object spins around an axis without altering its linear position?

A. linear motion

B.rotational motion

C.translational motion

D.vibrational motion

The answer would be b) my friend