Physics :asked onmikaelalcool49

18.05.2023the following question

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## Step-by-step answer

18.05.2023, solved by verified expert

The correct answer is average speed.

Since we are referring to distance expressed over time taken we are referring to average speed.

If it is displacement expressed over time taken, then we get the average velocity.

Also the velocity expressed over time will give us average acceleration.

Note that distance is a scalar quantity so it goes with another scalar quantity which is speed.

The displacement which is also a vector quantity will go with velocity which is also a vector quantity.

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Physics

The distance traveled by an object divided by the time it takes to travel that distance is a)average velocity b)average speed c)average acceleration d)negative acceleration

Step-by-step answer

**P** Answered by PhD 3

The correct answer is average speed.

Since we are referring to distance expressed over time taken we are referring to average speed.

If it is displacement expressed over time taken, then we get the average velocity.

Also the velocity expressed over time will give us average acceleration.

Note that distance is a scalar quantity so it goes with another scalar quantity which is speed.

The displacement which is also a vector quantity will go with velocity which is also a vector quantity.

Physics

A puck moves 2.35 m/s in a -22.0° direction. A hockey stick pushes it for 0.215 s, changing its velocity to 6.42 m/s in a 50.0° direction. What was the magnitude of the acceleration?

Step-by-step answer

**P** Answered by PhD

Answer:

7.25 secs.

Explanation:

First find the distance it takes to stop

s = [v^2-u^2]/2a = 0^2 - 8.7^2/2[-2.4] = 8.7^2/4.8

Next find the time it takes to go that distance , s = ut +[1/2] at^2

8.7^2/4.8 = 8.7t +[1/2] [ -2.4]t^2 , rearrange and

t^2 -[8.7/1.2]+ 8.7^2/[(1.2)(4.8)]=0 complete the square

[t - (8.7/2.4)]^2=0

t = 8.7/2.4 = 3.625 secs

At this stage the deceleration will push the object back in the direction it came from for another 3.625 secs when it will be 8.7 m/s again

Total time , T =2t = 7.25 secs.

Note:

The term differential is used in calculus to refer to an infinitesimal (infinitely small) change in some varying quantity. For example, if x is a variable, then a change in the value of x is often denoted Δx (pronounced delta x). The differential dx represents an infinitely small change in the variable x.

Physics

compare the momentum of a 6,300 kg elephant walking 0.11 m/s and a 50-kg dolphins swimming 10.m/s

Step-by-step answer

**P** Answered by PhD 1

First sum applied the Newton's second law motion: F = ma

Force = mass* acceleration

This motion define force as the product of mass times Acceleration (vs.Velocity). Since acceleration is the change in velocity divided by time,

force=(mass*velocity)/time

such that, (mass*velocity)/time=momentum/time

Therefore we get mass*velocity=momentum

Momentum=mass*velocity

Elephant mass=6300 kg; velocity=0.11 m/s

Momentum=6300*0.11

P=693 kg (m/s)

Dolphin mass=50 kg; velocity=10.4 m/s

Momentum=50*10.4

P=520 kg (m/s)

The elephant has more momentum(P) because it is large.

Physics

An electrical kettle supplies 20,000j of energy to heat 0.5kg of water. What is the temperature change? The specific heat capacity of water is 4200j/kg.

Step-by-step answer

**P** Answered by PhD

The change in temperature is 9.52°CExplanation:Since, the heat supplied by the electric kettle is totally used to increase the temperature of the water.Thus, from the law of conservation of energy can be stated as:Heat Supplied by Electric Kettle = Heat Absorbed by WaterHeat Supplied by Electric Kettle = m C ΔTwhere,Heat Supplied by Electric Kettle = 20,000 JMass of water = m = 0.5 kgSpecific Heat Capacity of Water = C = 4200 J/kg.°CChange in Temperature of Water = ΔTTherefore,20,000 J = (0.5 kg)(4200 J/kg.°C) ΔTΔT = 20,000 J/(2100 J/°C)ΔT = 9.52°C

Physics

Jordan lifts a 100-kilogram barbell from the floor to a height of 2.0 meters in 1.5 seconds. The amount of power he generates is about ____ watts.

Step-by-step answer

**P** Answered by PhD 1

Weight of barbell (m) = 100 kg

Uplifted to height (h) = 2m

Time taken= 1.5 s

Work done by Jordan = potential energy stored in barbell = mgh

= 100×2×9.8

= 1960J

Power = energy/time

= 1960/1.5

1306.67watts

Physics

Jasmine, who weighs 400 newtons, moves up a 5.0-meter climbing wall in 15 seconds. The amount of power generated by Jasmine as she climbs the wall is about ____ watts.

Step-by-step answer

**P** Answered by PhD

Weight of jasmine (m) = 400 N

Height climbed on wall (h) = 5m

Total time taken in climbing = 5 sec

Work done in climbing the wall = rise in potential energy = mgh

= 400×9.8×51

= 19600J

Power generated by Jasmine = potential energy / time

= 19600/5

= 3920Watts

Physics

Klay Thompson and Draymond Green wanted to play a joke on Steph Curry. Klay threw a ballon horizontally at 50 m/s from 150 m high bridge. How far did the ballow go when it landed?

Step-by-step answer

**P** Answered by PhD

The horizontal and vertical motions of balloons are independent from each other.

Let vertical component of initial velocity U' horizontal component of initial velocity U"

Time of landing (t) is found with the help of vertical motion.

Since vertical component of initial velocity of balloon is zero(U' = 0)

From equation h = U't + 1/2gt^2

h = 1/2gt^2

t = √(2h/g)

t = √( 2×150/9.8)

t = 5.53 sec

Horizontal velocity = 50m/s

Horizontal range of balloon, R = U"t

= 50× 5.53

= 27.65m

So the balloon will go 27.65 metre away from the bridge

Physics

an object falls from a high building . ignoring air resistance what will it’s velocity be after 3 seconds of falling ?

Step-by-step answer

**P** Answered by PhD 1

Gravity acceleration (g) = 9.8m/s^2

Time (t) = 3sec

Acceleration = velocity/time

Velocity = acceleration×time

= 9.8×3

= 29.4m/s

Physics

an object falls from a high building and hits the ground in 4.5 seconds . Ignoring air resistance. What is the distance that it fell ?

Step-by-step answer

**P** Answered by PhD

Initial velocity (u) = 0

Time taken = 4.5 seconds

Gravitational acceleration (g) = 9.8m/s^2

By the second equation of motion under gravity,

The distance that object fell down (h)

h = ut + (1/2)gt^2

h = 0×4.5 + (1/2)×9.8×(4.5)^2

h = 99.225 m

Physics

an object fall from the Teaneck tower in Houston and takes 12 seconds to reach the ground . What is its velocity at impact if air resistance is ignored

Step-by-step answer

**P** Answered by PhD

Gravitational acceleration (g) = 9.8m/s^2

Time of flight = 12 seconds

Acceleration = velocity/time

Velocity = acceleration × time

= 9.8×12

= 117.6 m/s

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