Question
In: Physics
a) if a 75w light bulb is left on for 2.0 hrs how much work is...
a) if a 75w light bulb is left on for 2.0 hrs how much work is done?
b)a winch thats powered by a 156W motor lifts crate 9.8m in 11 seconds. what is the mass of the create?
Solutions
Expert Solution
a) work is form of energy as,
W = P*t
where W is work done, P is power and t is time.
W = 75 * 2* 60 *60
W = 5.4 * 10^5 J
b) as power is the work done per unit of time,
P = W/t
work is a type of energy and the object at a certain height have potential energy.
P = m*g*h/t
where m is the mass of crate, g is accelaration due to gravity and h is the height
using the known values,
156 = m*9.8*9.8/11
solving for m,
m = 17.86 kg
genius_generous answered 2 years agoRelated Solutions
Consider a light bulb connected to a battery with wires. How must the light bulb be...
Consider a light bulb connected to a battery with wires. How
must the light bulb be connected in order for it to light?
Identify the relevant parts of the bulb and battery. Explain,
using the concept of potential difference, why and how your
configuration causes the bulb to light. Do not use the phrase
"complete circuit".
A light bulb manufacturer guarantees that the mean life of a certain type of light bulb...
A light bulb manufacturer guarantees that the mean life of a
certain type of light bulb is at least 720 hours. A random sample
of 51 light bulbs as a mean of 701.6 hours with a population
standard deviation of 62 hours. At an α=0.05, can you support the
company’s claim using the test statistic? claim is the alternative,
reject the null and support claim as test statistic (-2.12) is not
in the rejection region defined by the critical value...
A light bulb manufacturer guarantees that the mean life of a certain type of light bulb...
A light bulb manufacturer guarantees that the mean life of a
certain type of light bulb is at least 757 hours. A random sample
of 22 light bulbs has a mean life of 729 hours. Assume the
population is normally distributed and the population standard
deviation is 65 hours. At a=0.02, do you have enough evidence to
reject the manufacturer's claim.
1. identify null and alternative hypothesis
2.identify region rejections on graph
3.identify standarized test statstics
4. interpret decision
8.8. A manufacturing company of light bulb claims that an average light bulb lasts 500 days....
8.8. A manufacturing company of light bulb claims that an
average light bulb lasts 500 days. A contractor randomly selects 30
bulbs for testing. The sampled bulbs last an average of 490 days,
with a standard deviation of 100 days. If the claim were true, what
is the probability that 30 randomly selected bulbs would have an
average life of no more than 490 days? [10]
Please include diagrams: a) A 100-W light bulb and a 40-W light bulb are both rated...
Please include diagrams:
a) A 100-W light bulb and a 40-W light bulb are both rated at
household voltage. i) Which light bulb will be brighter if the two
bulbs are connected in parallel and this combination connected to a
household voltage source? ii) Which light bulb will be brighter if
they are connected in series and this combination connected to a
household voltage? b) A battery charges a parallel plate capacitor.
After it is fully charged, it is then...
Describe how you would observe the light coming from a light bulb. What is the color,...
Describe how you would observe the light coming from a light bulb.
What is the color, directionality, intensity, etc.?
what are required components to use a capacitor to light a bulb and how does the...
what are required components to use a capacitor to light a bulb and
how does the system operate?
An electric light bulb is made of an evacuated, i.e. no air inside the bulb, glass...
An electric light bulb is made of an evacuated, i.e. no air
inside the bulb, glass bulb containing a long thin tungsten
filament. The resistivity of tungsten is is 6.87x10 -7 Ohm meters
at the temperature of the filament. The filament can be modeled as
a 580 mm long thin cylinder with 0.046 mm diameter. The light bulb
is plugged into a 120 V wall outlet. The power dissipated by the
filament is radiated away as black body radiation with...
A light bulb is connected to a 60-V wall socket. The current in the bulb depends...
A light bulb is connected to a 60-V wall socket. The current in
the bulb depends on the time t according to the relation I = (1.414
A) sin[(282.6 Hz)t].
(a) What is the frequency of the alternating current? Hz
(b) Determine the resistance of the bulb's filament? Ω
(c) What is the average power delivered to the light bulb? W
How much power does bulb A dissipate when the switch is open?
Problem 23.60 If the battery in (Figure 1 ) were ideal, lightbulb A would not dim when the switch is closed. However, real batteries have a small internal resistance, which we can model as the 0.3Ω resistor shown inside the battery. In this case, the brightness of bulb A changes when the switch is closed. Assume E=2.0 V.Part AHow much power does bulb A dissipate when the switch is open?Part BHow much power does bulb A dissipate when the switch is closed?
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- Can you show how to do this step by step using Matlab please. Write a function...
- Plaintiff died of gas asphyxiation when he entered a sewer tunnel without a mask to answer...
- Retail Co has a unique set of HR practices. Describe and evaluate how you think the...
- Discuss some of the ways artists experimented with new styles and techniques, and how these differed...
- What is the recurrence relation for T(n) = (n-1)T(n-1) + n?
- Q2: Specify any four difference between Client/Server computing and Peer-to-Peer computing. Which architecture used by Bitcoin...
- Assignment 5: Roman Numerals Assignment 5 You must create an application that takes two integer values,...
ADVERTISEMENT