A 1451 kg car is traveling at 48.0 km/h. How much kinetic energy does it possess? K.E. =

Answers

Answer 1

Answer:
   Kinetic energy = (1/2) (mass) (speed)²

BUT . . . in order to use this equation just the way it's written,
the speed has to be in meters per second. So we'll have to
make that conversion.

KE = (1/2) · (1,451 kg) · (48 km/hr)² · (1000 m/km)² · (1 hr/3,600 sec)²

   = (725.5) · (48 · 1000 · 1 / 3,600)² (kg) · (km·m·hr / hr·km·sec)²

   = (725.5) · ( 40/3 )² · ( kg·m² / sec²)

   = 128,978 joules (rounded)

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Protons and electrons possess the same amount of charge, 1.6 × 10−19 C, but the charges have opposite signs. If a proton and an electron are positioned 4.9 × 10−11 m away from each other, what is the electrostatic force between them?A.
−9.6 × 10−8 N
B.
−6.0 × 10−7 N
C.
4.7 × 10−36 N
D.
2.9 × 10−17 N

Answers

Answer:

A:-9.6×10-8 N

Explanation:

is correct answer

A truck on a straight road starts from rest, accelerating at 2.00 m/s2 until it reaches a speed of 20.0 m/s. Then the truck travels for 20.0 s at constant speed until the brakes are applied, stopping the truck in a uniform manner in an additional 5.00 s. (a) How long is the truck in motion? (b) What is the average velocity of the truck for the motion described?

Answers

You can use the equation
V_xf = V_xi + a_x(t)

V_xf = 20.0m/s
V_xi = 0m/s
ax = 2.0t

Thus, solve for t and get 10secondsand then take 5 seconds to break after 20 seconds of drivingso for

a) 10 + 20 + 5 = 35 seconds

for part b)
You can use the formula
Delta x/Delta t = average velocity

Need to find xf, knowing xi = 0

Thus, use the formula
x_f = x_i + V_xi(t) + (1/2)a_x(t)^(2)
x_f = 0 + 0(10) + (1/2)(2.0)(10)^(2)
x_f = 100m

so for the first 10 seconds the truck traveled 100msAt a speed of 20m/s

20m/s = xm/20s20*20 = x
x = 400

thus we have 100+400 = 500mthen it slows down from 500m to x_f

thus I use the equation
x_f = x_i + (1/2)(V_xf + V_xi)t
x_f = 500 + (1/2)(0 + 20)(5)x_f = 500 + 50
x_f = 550

therefore the total distance traveled is 550m

to calculate average velocity
550/35 = 16m/s

thusV_xavg = 16m/s

What is the current when a 71-W lamp is connected to 120 V?

Answers

Power = (voltage) · (current)

71 W = (120 V) · (current)

Divide each side by (120 V) :

Current = (71 W) / (120 V) = 0.59167 Amperes

What I want to know is: Where can I buy a 71-W light bulb ?

What is the rate at which electrical energy is converted into another form

Answers

The RATE of producing, moving, converting, or using energy is "power".
The unit is "watt". 1 watt means 1 joule of energy per second.

Answer:

electric power

Explanation:

When using a moveable pulley to lift an object, _______ of the object's weight is supported by the section of rope attached to the ceiling. This is why a moveable pulley requires _______ effort force than a fixed pulley to lift an object. A. half, less B. all, less C. half, more D. all, more

Answers

Answer:

UGHH IT WAS HALF AND LESS OMG :(

Explanation:

An object at rest has no net force acting on it.
True or False

Answers

That’s True bc an unbalanced force would need to keep and object in motion at a constant velocity.

Answer:

True

Explanation:

The object is at rest, which means it's not moving, so there is no net force on it, according to Newton's First Law.

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