The mass m of an object is known as the amount of material it has. Weight is the force that mass is attracted to planet Earth or another object much bigger than it. The relation between them is

*

Where g is the acceleration of gravity (

*
on Earth)

1. If we know the mass of an object m=7 kg, we can compute its weight

*

*

2. If we know the weight W=65 N of some object, we can compute its mass

*

*

*



LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. A typical LASIK laser emits a 1.

You are watching: Calculate the weight of a 7 kg object


lifwynnfoundation.org:

143 kW

Explanation:

Given that

Diameter of the beam, d = 1 mm

Wavelength of the beam, λ = 193 nm

Time used by the pulse, t = 14 ns

Energy of the pulse, U = 2 mJ

Recall that Power can be mathematically calculated using the relation,

Power = Work Done / Time,

To solve this, we apply the formula

P = U / Δt

P = 2*10^-3 J / 14*10^-9 s

P = 142857 W

P = 143 kW



The eastern time zone would the opposite side of the angle made by his car. So this means he would be traveling 30cos30 m/s completely in the east direction. Or approximately 26 m/s in the East direction. 5000 m divided by this lifwynnfoundation.org results in approximately 192 seconds. I would use a calculator to get a more exact lifwynnfoundation.org

lifwynnfoundation.org:

The required elastic potential energy is 0.068J

Explanation:

Given,

Spring force constant, k= 3.4 N/M

Spring stretch length/ Displacement, x= 0.2m

We know,

Elastic potential energy, V=

*

=

*

=

*

=0.068

∴The required elastic potential energy is 0.068J



A net force of –8750N is used to stop of 1250.kg car travelling 25m/s. What braking distance is needed to bring the car to a hal

lifwynnfoundation.org:

d = 44.64 m

Explanation:

Given that,

Net force acting on the car, F = -8750 N

The mass of the car, m = 1250 kg

Initial speed of the car, u = 25 m/s

Final speed, v = 0 (it stops)

The formula for the net force is :

F = ma

a is acceleration of the car

*

Let d be the breaking distance. It can be calculated using third equation of motion as :

*

So, the required distance covered by the car is 44.64 m.



According to a general theory of crime, individuals who engage in crime are also likely to engage in other risky behaviors, for

lifwynnfoundation.org:

construct validity

Explanation:

According to my research on studies conducted by various psychologists, I can say that based on the information provided within the question it seems that the researcher is using construct validity. This is the act of measuring or validating what the extent to which a claim is true. In this situation since the claim states that people involved in crimes tend to do speed and drugs, then the researcher compares the criminals responses to those areas to test the validity of the claim.

See more: Why Does Straight Beat A Full House Beat A Flush Or A Straight?

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9 months ago
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