What can you say about the effort force needed to lift an object using an ideal lever with a force advantage greater than 1?

Select one:
a. The effort force is the same as the lifting force.
b. The effort force is less than the lifting force.
c. The effort force is greater than the lifting force.
d. You have to use the formula to calculate the effort force.

Answer:

C. Surface tension

What property of water allowed the paperclip to stay on the top of the water?

Surface Tension

The strong surface tension enables the paper clip float on the water, despite its much higher density which is caused by the cohesive forces between liquid molecules.

The motorcycle's average velocity will be 20 m/sec. The ratio of the overall distance traveled to the total time taken by the body is the average velocity.

The average velocity is the ratio of the total distance traveled to the total time taken by the body. Its unit is m/sec.

V= 72km/hr =20 m/sec

Total distance travelled by the  motorcycle;

D= v ×t

D=(20 m/sec)×20 sec

D=400 m

The average velocity is:

[tex]\rm v_{avg}=\frac{d_{total}}{t_{total}} \\\\ \rm v_{avg}=\frac{400}{20} \\\\ v_{avg}=20 m/sec[/tex]

Hence,the motorcycle’s average velocity will be 20 m/sec.

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A diverging lens is used to permit clear vision of an object placed at infinity. The focal length of the lens is -100 cm.

The focal length is half of the radius of curvature of the focal lens.

By the lens maker formula,

1/f = 1/v +1/u

where, v is the image distance and u is the object distance.

Give, the object is at infinity and the image must form at 100 cm, the the focal length will be

1/f = 1/ -100 + 1/∞

f = -100 cm

The focal length must be -100 cm for the diverging lens.

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The time it will take to decay 6.25 grams is 24.4684 days.

A radioactive substance's half-life is often described as the amount of time it takes for one of its atoms to break apart or transform into another. Ernest Rutherford originally examined the theory in 1907. This is typically represented by the sign Ug or t1/2.

To make the concept clearer, let's use a radioactive element with an hour-long half-life.

Now according to the question the given values are :

T(1/2) for iodine-131 is 5.10 days,

[A]₀ for iodine-131 is 50 grams and,

[A] for iodine-131 is 6.25 grams.

T(1/2)=0.693/k

⇒8.10=0.693/k

⇒k=0.865 [tex]days^{-1}[/tex].

2.303 log [A]₀/[A]= kt

2.303 log(50.00/6.25)= 0.085×t

⇒t=1/0.085×2.303×log8

t=24.4684 days

Hence, the time it will take to decay is 24.4684 days.

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Answer:

23,49 m/s

Explanation:

Ep= Ek

mgh=mv2/2

6×10×30=6v2/2

1800=6 v2/2

6 v2=3600

v2 =600

v=24,49 m/s

The velocity of the stone, if a stone of mass 6 kg is released from a height of 30 m, is 24.5 m/s.

When something is moving, its velocity shows how quickly its location is changing as seen from a certain angle and as measured by a particular unit of time.

If a point moves a certain distance along its path in a predetermined length of time, its average speed throughout that time is equal to the distance traveled divided by the travel time. For instance, a train traveling 100 km in two hours is doing it at an average speed of 50 km/h.

Given:

The mass of the stone, m = 6 kg,

The height of the release, h = 30 m,

The value of gravity, g = 10 m/s,

Calculate the velocity using energy conservation as shown below,

The kinetic energy = potential energy  (Energy conservation)

1/2 × 6 × v² = 6 × 10 × 30

v² = 300 × 2

v² = 600

v = √600

v = 10√6

v = 10 × 2.45

v = 24.49 or 24.5 m/s

Thus, the velocity is 24.5 m/s.

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Answer:

Explanation:

Its surface is rocky, with canyons, volcanoes, dry lake beds and craters all over it. Red dust covers most of its surface. Mars has clouds and wind just like Earth

Answer:

Carbohydrates - monosaccharides.

Lipids - glycerol and fatty acids.

Nucleic acids - nucleotides.

Proteins - amino acids.

Explanation:

Answer:

lonic compounds generally form between elements that are metals and elements that are nonmetals. For example, the metal calcium (Ca) and the nonmetal chlorine (Cl) form the ionic compound calcium chloride (CaCl2). In this compound, there are two negative chloride ions for each positive calcium ion.

Explanation:

Answer:Ionic compounds generally form between elements that are metals and elements that are nonmetals. For example, the metal calcium (Ca) and the nonmetal chlorine (Cl) form the ionic compound calcium chloride (CaCl2). In this compound, there are two negative chloride ions for each positive calcium ion.

Explanation:

The mass of the string is 0.515 kg.

Given that:

To solve for the mass of the string,

Therefore, the mass would be[tex]15.9*0.03242= 0.515448= 0.515[kg][/tex]

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The tension on the string when the coefficient of sliding kinetic friction between the block and floor is 0.2 is calculated as 19.8N

The force acting on the block in the horizontal direction is given by:

F_net = ma

where F_net is the net force acting on the block, m is the mass of the block, and a is its acceleration.

The force of friction opposing the motion of the block is given by:

F(friction) = μKN

where μK is the coefficient of kinetic friction between the block and the floor, and N is the normal force acting on the block due to the floor.

Since the block is pulled horizontally, the normal force acting on the block is equal and opposite to the weight of the block, which is given by:

N = mg

where g is the acceleration due to gravity.

Therefore, the net force acting on the block is:

Fnet = T - F (friction) = ma

where T is the tension in the string.

Substituting the expressions for F (friction), N, and Fnet, we get:

T - μKmg = ma

Solving for T, we get:

T = ma + μKmg

Substituting the given values, we get:

T = (5.0 kg)(2 m/s^2) + (0.2)(5.0 kg)(9.8 m/s^2)

Simplifying, we get:

T ≈ 19.8 N

Therefore, the tension in the string is approximately 19.8 N.

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Explanation:

-226 of 1600

-14 of 5730

-226×16÷100= -36.16

-14×57.3÷100= -802.2

The decay constant for radium-226 is larger than the decay constant for carbon-14.

Decay constant of radioactive substance is its probability of decay per unit time.

Decay constant for radium-226 is [tex]1.4*10^{-11} /sec[/tex]  and for carbon-14 is [tex]3.8*10^{-12} /sec[/tex].

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Answer:

Violet (Shortest Wave Length)

Explanation:

Violet waves have the highest frequencies. The highest frequencies have the shortest wave length.

Answer:

The object obeys the equation

F = M a     on both the earth and the moon (mass does not depend on location)

The problem is a little misleading because if an object has a mass of

10 kg then its weight is 10 kg * 9.8 m/s^2 = 98 Newtons

That means that weight is not expressed in Kg but rather in Newtons

Newton's Law is true on the moon as it is on the earth and F = M a

An object that weighed 10 N on earth would weigh 10 / 6 = 1.67 N on the moon

One must take care in describing a force in units of Newtons not in Kg

#1

True

All metals attract magnets

#2

Yes true

Away from magnetic field if you place something it won't attract that

#3

False

Its only possible in case of electromagnetic force fields .

#4

False

Electromagnetic force field

#5

True

The minimum amount of heat needed to melt it to a liquid will be 569.067 kJ.

The minimum amount of heat needed to melt it to a liquid is known as the enthalpy of fusion.

The formula for the enthalpy of the fusion is;

[tex]\rm L_f=Q/m \\\\ L_f=mCdt/m \\\\ L_f= Cdt \\\\ L_f= 899 J/kg^0C \times (660^0-27^0) \\\\ L_f= 569,067 \ J \\\\\ L_f=569.067 \ kJ[/tex]

Hence, the minimum amount of heat needed to melt it to a liquid will be 569.067 kJ.

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Answer:

nerves

Explanation:

The optic nerve is the nerve in each eye that carries the signal from your eye to your brain.

Answer:

A. It pulls objects towards the center of Earth.

Explanation:

Think about dropping something, where does it go? If you are on earth, this goes down towards the ground due to the attractive force of gravity on every object (to pull everything to center of earth). Like Newton's apple.

Answer:

infrasound

Explanation:

strong winds that come together from different directions

When charging a fully depleted battery with a 220/240-volt charging dock, Nissan LEAF can be fully charged in about 7.5h.

It converts the electro chemical energy to the electrical energy when connected across the two ends of the conductor.

The Nissan LEAF comprises of a standard 120-V charging cable.  In order to charge it fully, we need a 220/240Volts battery. The time take take n to fully charge is 7.5 hours.

Thus, when charging a fully depleted battery with a 220/240-volt charging dock, Nissan LEAF can be fully charged in about 7.5 h.

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Answer:

Taking forces along the plane

F cos θ - M g sin θ -100 = M a       net of forces along the plane

F = (M a + M g * .5 + 100) / .866     solving for F

F = (80 * 1.5 + 80 * 9.8 * .5 + 100) / .866 = 707 N

F = 707 N acting along the plane

Fn = F sin θ + M g cos θ       forces acting perpendicular to plane

Fn = 707 * 1/2 + 80 * 9.8 * .866 = 1030 Newtons   forces normal to plane

(this would give a coefficient of friction of 100 / 1030 = .097 = Fn)

Answer:

150w

Explanation:

power = workdone/time

9000/60

150w

Answer:

See below ~

Explanation:

What is happening to each event as the climate changes? Temperatures are increasing, carbon dioxide levels are increasing, the pH of the ocean is decreasing, sea levels are increasing, and the amount of sea ice is decreasing.

Here are orders of answers from start

The main reason behind these situations is global warming

The emmison of carbon dioxide has increased a lot which is getting harmful day by day

Answer:

It will not. The thing with wind is as long as the earth rotates and creates and uneven heating of the atmosphere, there will be infinite wind.

Explanation:

a)The time taken between the parcel leaving the airplane, and it's striking the ground will be 6.38 second

c)The speed at which the parcel strikes the ground will be 62.64 m/sec.

Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. it is denoted by U for the initial speed while V for the final speed. its SI unit is m/sec.

The given data in the problem is;

Steady speed (V)= 90 m/s

Altitude (h) = 200 m

Time taken (t)=?

horizontal distance travelled(d)=?

Striking speed(V)=?

The striking speed is;

[tex]\rm V^2=U^2+2gh \\\\ V=\sqrt{2gh} \\\\V=\sqrt{2\times 9.81 \times 200} \\\\ V= \sqrt{3924} \\\\ V=62.64 \ m/sec[/tex]

The time taken is found as;

[tex]\rm H = ut + \frac{1}{2} gt^2 \\\\ 200=0+ \frac{1}{2} \times 9.81 \times t^2 \\\\ t=6.38 \ sec[/tex]

Hence, the time taken between the parcel leaving the airplane, and it's striking the ground will be 6.38 second

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Explanation:

the answer is 2.46 × 10^12

Answer:

The energy efficiency represents the things you can do with some amount of energy, and if you can do more with less, than it reduces the energy consumption.

Explanation:

The answer to this question is actually very simple. Imagine that you use only the half of the energy you produce, an efficiency of 50%. Lets say you need 5kJ, so you would need to produce 10kJ, because you can consume only the half. Now, imagine you increase the efficiency, you use exactly what you can generate, (efficiency of 100%). In this case, if you needed only 5kJ you would need to generate only 5kJ.