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3 years ago

Object B has a mass of 8 kg and was lifted at a rate of 3 m/s. What is the kinetic energy of object B?

Physics

1 answer:

Greeley [361]3 years ago

5 0

Answer:36J

Explanation:

mass=m=8kg

Velocity=v=3m/s

Kinetic energy=ke

Ke=0.5 x m x v x v

Ke=0.5 x 8 x 3 x 3

Ke=36

Kinetic energy is 36J

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The weights of soy patties sold by a diner are normally distributed. A random sample of 15 patties yields a mean weight of 3.8 o

shepuryov [24]

Complete Question

The weights of soy patties sold by a diner are normally distributed. A random sample of 15 patties yields a mean weight of 3.8 ounces with a sample standard deviation of 0.5 ounces. At the 0.05 level of significance,perform a hypothesis test to see if the true mean weight is less than 4 ounce.

Answer:

Yes the true mean weight is less than 4 ounce

Explanation:

From the question we are told that

The random sample is $n = 15$

The mean weight is $\= x = 3.8\ ounce$

The standard deviation is $\sigma = 0.5 \ ounce$

The level of significance is $\alpha = 0.05$

The null hypothesis is $H_o : \mu \ge 4$

The alternative hypothesis is $H_a : \mu < 4$

Generally the critical value which a bench mark to ascertain whether the null hypothesis is true or false is mathematically represented as

$t_{0.05} = 1.79$

This value is obtained from the critical value table

Generally the test statistics is mathematically represented as

$Test \ Statistics (ST) = \frac{\= x - \mu }{\frac{\sigma}{\sqrt{n} } }$

=> $ST = \frac{3.8 -4 }{\frac{0.5}{\sqrt{20} } }$

$ST = - 1.79$

So since ST is less than $t_{0.05}$ then the null hypothesis would be rejected and the alternative hypothesis would be accepted so

Thus the true mean weight is less than 4

4 0

3 years ago

Why is magnesium the limiting reactant in this experiment

Keith_Richards [23]

Answer:

Explanation:

Magnesium is being oxidized by the oxygen in the air to magnesium oxide. This is a highly exothermic combustion reaction, giving off intense heat and light. The reaction of the combustion of magnesium in oxygen is given below:

2Mg(s) + O2(g) → 2MgO(s)

The stoichiometric factor is 2 moles of magnesium are burned for every 1 mole of oxygen (2mol Mg/1mol O2). If the magnesium strip weighs 1 gram, then there is 0.04 mol of magnesium (1 gram divided by 24.3 grams/mol Mg) available in the reaction. The amount of oxygen required to completely react with the magnesium strip is:

0.04 mol Mg x (1 mol O2 / 2 mol Mg) = 0.02 mol O2 x 16 g/mol O2 = 0.32 gram O2.

The magnesium will burn until consumed entirely. There is much more oxygen available in the atmosphere than needed to consume the magnesium. Thus the magnesium is the limiting reactant because it determines the amount of product formed.

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3 years ago

How can geo thermal energy be used ?

jek_recluse [69]

Answer:

Geothermal energy can heat, cool, and generate electricity: Geothermal energy can be used in different ways depending on the resource and technology chosen—heating and cooling buildings through geothermal heat pumps, generating electricity through geothermal power plants, and heating structures through direct-use

Explanation:

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1 year ago

Read 2 more answers

The primary coil of a transformer contains 100 turns; the secondary has 200 turns. The primary coil is connected to a size aa ba

tester [92]

Answer:

3 volts

Explanation:

Number of turns in primary coil = $N_{p}$ = 100