Answer:
some amount of ambition is good for your motivation but excess ambition is dangerous.
An object of mass 2kg is thrown vertically downwards with an initial kinetic energy of 100J. What is the distance fallen by the object at the instant when its kinetic energy has doubled
The distance fallen by the object at the instant when its kinetic energy has doubled is 5.097m
The kinetic energy of an object is the energy possessed by the body by virtue of its motion.
The gravitational potential energy (energy due to the virtue of its position) of a body is being converted to Kinetic energy once an object falls.
Using the law of conservation of energy according to the equation:
Kinectic Energy = Potential Energy
Since PE = mgh
KE = PE = mgh
Given the following parameters
KE = 100J
m = 2kg
g = 9.81m/s²
Required
Height h
Substitute the required values into the formula
100 = 2(9.81)h
h = 100/19.62
h = 5.097m
Hence the distance fallen by the object at the instant when its kinetic energy has doubled is 5.097m
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People used to believe that if a penny was dropped ff Tom the Empire State Building, how fast would it be moving just before impact on ground? From release of your hand it takes 45 seconds falling at 9.8 m/s^2 due to gravity l.
Answer:
99
Explanation:
10. Numerical problems:
b. A stone is thrown vertically upwards with an initial velocity of 20 m/sec.find the maximum height it reaches and the time taken by it to reach the height. (g = 10 m/s2).
c. A car is moving at a rate of 72 km/hr. How far does the car move when it stops after 4 seconds?
d. A bus starts from rest. If the acceleration is 2 m/s2, find
1. the distance travelled.
2. the velocity after 2 seconds.
e. A stone is thrown vertically upward with the velocity of 25 m/s. How longo it take to reach the maximum height? Also calculate the height.
with process please
Answer:
a)20 m,2s
Explanation:
Given
Initial velocity=20 m /sec
g=10 m/s square
v =0m/s
h =?
t =?
now,
v = U +gt
=v=20 +10t
Or,10t=20
Or,t=20
10
therfore ,2 s.
Again,
h=ut -1 gt square
2
Or, h=20×2-1×10(2)square (multiply and cut )2×5 =10
; 2
Or,40-5×4
therefore , 20m
How do particles differ after a physical change
Answer:
In physical changes, no new materials are formed and the particles do not change apart from gaining or losing energy. ... Particles stay the same unless there is a chemical change whether the matter is solid, liquid or gas. Only their arrangement, energy and movement change.
Explanation:
11 An unstretched spring is 12,0 cm long. A load of 5.0N stretches it to 15.0cm. How long will it be under a load
of 15N? (Assume that the spring obeys Hooke's law.)
Answer: Approximately 22 cm
=========================================================
Explanation:
The unstretched spring is 12.0 cm long. When adding a load of 5.0 N, it stretches to 15.0 cm. This is a displacement of 15.0 - 12.0 = 3.0 cm, which is the amount the spring is stretched.
Convert this displacement to meters (so that it fits with the meters unit buried in Newtons).
3.0 cm = (3.0)/100 = 0.03 m
Apply Hooke's Law to find the spring constant k
F = -kx
5.0 = -k*(0.03)
k = -(5.0)/(0.03)
k = -166.667 approximately
Now we must find the displacement x when F = 15 newtons
F = -kx
-kx = F
x = F/(-k)
x = -F/k
x = -15/(-166.667)
x = 0.089 approximately
x = 0.1
The displacement to one decimal place is about 0.1 meters, which converts to 100*0.1 = 10 cm
So the spring will be stretched to about 12cm+10cm = 22 cm
35/h expressed in meter per second
Answer:
9.722
Explanation:
35*1000÷1×60*60
35000÷3600
9.722
The quantity of matter inside the body is?
Answer:
mass is the quantity of matter inside the body
Answer:
The mass of a body is the quality of matter it contains
Electrons could be swiped off of the
outermost shell of the electron
True
False
if you are planning to go for hiking on the mountain,what type of shoes will you wear
Answer:
you will have to wear hiking shoes or sports shoes
a block occupies 0.2587 ft. what is the volume in mm?
Answer:
70
Explanation:
A motorcycle is moving with the velocity of 72km/h. If the velocity reaches 40m/s after 0.5m calculate the acceleration
Answer:
72km/hr
= 72× 1000m/1×60×60 sec
= 72000m/ 3600sec
=20m/s
0.5 m
= 0.5×60 sec
= 30 sec
Now,
acceleration = v-u/t
= 40m/s-20m/s divided by 30 sec
= 20m/s divided by 30 sec
= 0.6m/s2
Explanation:
hope this helps you
The density of gold is 19.3 g cm³. What is the mass of a bar of gold in Kg that measures 6 cm x 4 cmx to 2 cm ?
solve
Answer: 0.9264 kg
Explanation: [I'll use "cc" for cubic centimeter, instead of cm^3.
The volume is 6cm*4cm*2cm = 48 cm^3 (cc).
Density of Au is 19.3 g/cc
Mass of gold = (48 cc)*(9.3 g/cc) = 926.4 grams Au
1 kg = 1,000 g
(926.4 grams Au)*(1 kg/1,000 g) = 0.9264 kg, 0.93 kg to 2 sig figs
At gold's current price of $57,500/kg, this bar is worth $53,268. Keep it hidden from your lab partner (and instructor).
4) Gabo bought three chicken dinners for $6.95 each and one hamburger meal for $5.75. He and three friends decide to divide the cost of the meals equally. How much money does Gabo receive in total from his three friends?
(A) $6.35 (B) $6.65 (C) $19.65 (D) $19.95 (E) $26.60
Answer: the answer is d $19.95
Explanation:
chicken dinner: 6.95 x 3 = 20.85
burger: 5.75
20.85 + 5.75 = 26.6
26.6 divided by 4 (bc theres 4 ppl and the bill needs to be split equally)
26.6/4= 6.65
and since 3 friends are paying him back u gotta do 6.65 x 3 = 19.95
how to convert m/s to miles/seconds
Answer:
Divide by 1609
Explanation:
So to convert from m/s to m/s divide by 1609
define null point
define null point
Answer:
In physics a null is a point in a field where the field quantity is zero as the result of two or more opposing quantities completely cancelling each other
What is pascal law? Define it
Answer:
Pascal's law states that the pressure exerted anywhere in a confined incompressible liquid is transmitted equally in all directions irrespective of the area on which it acts and it always acts at right angles to the surface of containing vessel.
have a great day sister
Based on the ionic notation shown here, what has happened to this ion. ***List all that apply!!!*** Fe2+ *
Atom has become an anion.
Atom has become a cation.
Atom has lost 2 electrons.
Atom has gained 2 electrons.
Answer:
atom has become cation
atom has lost 2 electrons
Explanation:
when atom loses electron they become positively charged and cation are positive ion
Who exerts more pressure? a) A girl of 50 kg, wearing heels with an area of 1 cm2. b) An elephant of 4000 kg with foot area of 250 cm2.
Answer:
The girl exerts more pressure.
Explanation:
Pressure can be defined as the force exerted normally or perpendicularly per unit area.
i.e P = F/A
Girls
Area of the heel = 1cm² = 10^(-4) m²
Force = mg = 50 × 10 = 500N
Pressure =
[tex] \frac{500}{10 ^{ - 4} } [/tex]
[tex] = 5 \times {10}^{6}[/tex]
Elephant
Area = 250cm² = 2.5 x 10^(-2)b m²
Force = mg = 40000N
Pressure =
[tex] \frac{40000}{2.5 \times {10}^{ - 2} } [/tex]
[tex] = 1.6 \times {10}^{6} [/tex]
A 0.0250kg golf ball is placed on a spring that is compressed 0.0500m. How high will the ball get when the spring is released if the spring constant is 200.N/m?
20.4m
2.04m
1.02m
40.8m
Answer:
1.02m
Explanation:
Apply Principle of conversation of energy,
mgh = 1/2 Ke²
0.0084x91 ...................
Answer:
0.0084×91=0.7644
Explanation:
hope this helps
please mark this answer as brainlist
s dispersion dispersion
, refraction
Answer:
If you want definition, here it is:
Dispersion is defined to be the spreading of white light into its full spectrum of wavelengths. Refraction is responsible for dispersion in rainbows and many other situations. The angle of refraction depends on the index of refraction, as we saw in The Law of Refraction.
can sound waves propagate in vacuum if yes why if no why not??
Answer:
please mark me brainliest
Explanation:
No, sound waves cannot travel in a vacuum. This is because sound waves are mechanical waves that need a medium (such as air and water) to travel. Sound in physics is defined as a vibration that propagates as an audible wave of pressure, through a medium such as a gas, liquid or solid.
For which length of wire are the readings of resistance the most precise
how do i solve this?
Answer:
hmmm i dont know....
Explanation:
i just wanted free point. TANKS YOU SIR!!
what happens when you try to walk on the smooth well polished floor wearing brand new shoes
Plzz help me fast
(There is both physics and chemistry question )
1) Write the molecular formula of the following by crisscross method :
1. Potassium sulphate
2. Sodium chloride
3. Ammonium chloride
4. Silver oxide
2) Prove that F=ma pl
Potassium Sulphate :-
[tex]\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\put(0,3){\bf K}\put(0,0){\bf 1}\put(4,3){\sf SO_4}\put(4,0){\bf -2}\put(0.2,2.9){\vector(4,-3){3.5}}\put(3.8,2.9){\vector(-4,-3){3.5}}\end{picture}[/tex]
[tex]\boxed{\sf K_2SO_4}[/tex]
Sodium chloride:-
[tex]\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\put(0,3){\bf Na}\put(0,0){\bf 1}\put(4,3){\sf Cl}\put(4,0){\bf -1}\put(0.2,2.9){\vector(4,-3){3.5}}\put(3.8,2.9){\vector(-4,-3){3.5}}\end{picture}[/tex]
[tex]\boxed{\sf NaCl}[/tex]
Ammonium Chloride
[tex]\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\put(0,3){\bf NH_4}\put(0,0){\bf 1}\put(4,3){\sf Cl}\put(4,0){\bf -1}\put(0.2,2.9){\vector(4,-3){3.5}}\put(3.8,2.9){\vector(-4,-3){3.5}}\end{picture}[/tex]
[tex]\boxed{\sf NH_4Cl}[/tex]
Silver Oxide
[tex]\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\put(0,3){\bf Ag}\put(0,0){\bf 1}\put(4,3){\sf O}\put(4,0){\bf -2}\put(0.2,2.9){\vector(4,-3){3.5}}\put(3.8,2.9){\vector(-4,-3){3.5}}\end{picture}[/tex]
[tex]\boxed{\sf Ag_2O}[/tex]
Question 1
A car travels 480 km in 12 hr. What is its velocity?
Explanation:
480km = 480000m
12hr = 43200 sec
480000/43200 = 11.1111111111
round up 2 sig fig
11m/s
answer is 11m/s
any three difference between distance and displacement
Answer:
1.) distance is always positive while displacement can be negative as well.
2.) distance cannot be 0 but displacement can be 0.
3.) distance is a scalar quantity while displacement is vector quantity.
Runner A is initially 8.4 km west of a flagpole and is running with a constant velocity of 4.8 km/h due east. Runner B is initially 6.0 km east of the flagpole and is running with a constant velocity of 8.4 km/h due west. What will be the distance of the two runners from the flagpole when their paths cross?
Thanks for your help :)
Answer:
Distance = 2m
Explanation:
Runner A : 1,75
Runner B : 0.71 ( divided speed over velocity for both & B)
Distance = 1,75 + 0,71 = 2,46 m
Is it right?