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3 years ago

If you can walk 3 miles per hour, how much is that in meters per second?

Physics

1 answer:

deff fn [24]3 years ago

4 0

To convert 3 miles per hour into m/s, first we have to convert miles in to meter and then hour in to second.

As $1 miles = 1.609344 km = 1.609344\times 10^3 m = 1609.3 m$ and $1 hour=60 minutes = 60\times 60= 3600s$

Therefore,

$3 miles/ h=\frac{3\times1609.3m}{3600s} =1.34 m/s$

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When a 2.60-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 2.86 cm. (a) W

Goryan [66]

Answer:

a) k = 891.82 N/m

b) e = 0.0143 m = 1.43 cm

c) W = 5.02 J

Explanation:

Step 1: Data given

Mass = 2.60 kg

the spring stretches 2.86 cm = 0.0286

Step 2: What is the force constant of the spring?

Force constant, k = force applied / extension produced

k = (2.60kg * 9.81N/kg) / 0.0326 m

k = 891.82 N/m

b) If the 2.60-kg object is removed, how far will the spring stretch if a 1.30-kg block is hung on it

Extension = F/k = (1.30 kg * 9.81) / 891.82 = 0.0143 m = 1.43 cm

Half the mass means half the extension

c) How much work must an external agent do to stretch the same spring 7.50 cm from its unstretched position?

W = average force used * distance

W = 1/2 * k*e * e = 1/2 k*e²

W = 1/2 * 891.82 * (0.075)² = W = 5.02 J

5 0

3 years ago

What is the kinetic energy of a 750 kg car moving at 50.0 km h?

Step2247 [10]

The kinetic energy of a 750 kg car moving at 50.0 km h is 72300 joules.

Given,

mass of car (m)= 750 kg

speed of car (v)= 50 km/h

= 50 x 5/18

= 13.9 m/s

we know that kinetic energy= 1/2 x m x v*v

= 1/2 x 750 x 13.9 *13.9

= 72300 joules

so the kinetic energy is 72300 joules.

Energy is the capacity of an object to do work, and like work, energy's unit is the joule (J). Energy exists in many different forms, but the one we think of most often when we think of energy is kinetic energy. Kinetic energy is often thought of as the energy of motion because it is used to describe objects that are moving.

Learn more about kinetic energy here :-

brainly.com/question/999862

#SPJ4

4 0

1 year ago

35 mL equals how much dL

stellarik [79]

35 ml is 0.35 decilitres

8 0

3 years ago

Read 2 more answers

Technician A says a short to voltage may or may not blow a fuse and may or may not affect more than one circuit. Technician B sa

Tomtit [17]

Answer:

C. Both A and B

Explanation:

Fuses are rated by the amperage they can carry before heat melts the element. The fuse is ideal for protection against short circuits. Short circuits produce enough amperage to vaporize a fuse element and break connection in one cycle of a 60-cycle system.

Specifically, the voltage rating determines the ability of the fuse to suppress the internal arcing that occurs after a fuse link melts and an arc is produced.

6 0

4 years ago

A 9 µF capacitor and a 16 H inductor are connected in series with a 60 Hz source whose rms output is 116 V. Find the rms current

AfilCa [17]

Answer:

19.2 mA

Explanation:

C = 9 micro farad = 9 x 10^-6 F

L = 16 H

f = 60 Hz

Vrms = 116 V

$X_{L}=2\times \pi \times f\times L$