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3 years ago

1. An electric iron has a rating of 750W, 220V. Calculate:

1 answer:

6 0

The equation for electrical power isP=VIwhere V is the voltage and I is the current. This can be rearranged to solve for I in 6(a). 6(b) can be solved with Ohm's LawV=IRor if you'd like, from power, after substituting Ohm's law in for IP=V2R For 7, realize that because they are in parallel, their voltages are the same. We can find the resistance of each lamp fromP=V2RThen the equivalent resistance as1R∗=1R1+1R2Then the total power asPt=V2R∗However, this will reveal that (with a bit of algebra)Pt=P1+P2 For 8, again the resistance can be found asP=V2RThe energy usage is simplyE=P⋅t

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Nuclear explosions can be ______ of times more powerful than the largest conventional weapon. A. Hundreds B. Millions C. Thousan

yuradex [85]

Answer:

Explanation:

7 0

3 years ago

Suppose that the ultrasound source placed on the mother's abdomen produces sound at a frequency 2 MHz (a megahertz is 10^610 6

ella [17]

Answer:

the maximum frequency observed is 2.0044 10⁶ Hz

Explanation:

This is a Doppler effect exercise. Where the emitter is still and the receiver is mobile, therefore the expression that describes the process is

f ’= $f_o \ ( \frac{v \pm v_o}{v} )$

the + sign is used when the observer approaches the source

typical speeds of a baby's heart stop are around 200 m / min

let's reduce to SI units

v₀ = 200 m / min (1 min / 60 s) = 3.33 m / s

let's calculate

f ’= 2 10⁶ ( $\frac{1500 \ \pm 3.33}{1500}$ )

f ’= 2.0044 10⁶ Hz

f ’= 1,9956 10⁶ Hz

therefore the maximum frequency observed is 2.0044 10⁶ Hz

8 0

3 years ago

This type of telescope uses a lens to collect light.

bezimeni [28]

Optical Telescopes....................................

7 0

4 years ago

13. Litmus paper can be used to determine if a solution is an acid or a base. There are two types of

Over [174]

Answer:

The main use of litmus is to test whether a solution is acidic or basic. Light Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F). Neutral litmus paper is purple.

Explanation:

7 0

3 years ago

The momentum of an object is not dependent on which one of the following quantitiesa) acceleration b) inertiac) massd) velocity

amm1812

Answer:

Inertia

Explanation:

We have to find that on which quantity the momentum of an object does not depend.

We know that

Momentum of object=mv

Where m=Mass of object

v=Velocity of object

Momentum of object depends upon mass and velocity.

When velocity of object increases then momentum is also increases.

When the mass of object is increases then the momentum of object is also increases.

If mass decreases then the momentum of object decreases.

If velocity decreases then the momentum of object decreases.

Acceleration depends on velocity because

Acceleration= $\frac{dv}{dt}$

Therefore, momentum is also depend upon the velocity.

Inertia is defined as the property of object that resist change in its motion.

Therefore, momentum does not depend on Inertia of object.

7 0

3 years ago