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Serggg [28]
3 years ago
13

Hey can anyone help me wih these questions please

Physics
1 answer:
Pavel [41]3 years ago
4 0
<span>The density of an object determines whether it will float or sink in another substance. An object will float if it is less dense than the liquid it is placed in.An object will sink if it is more dense than the liquid it is placed in.

Since the above solid sinks to the bottom it reflects that the object is less dense that the water.

Hope this answers your question</span>
You might be interested in
Suppose the displacement x of another object is related to time t according to x = A sin(2nft), where A and f are constants. Wha
Korolek [52]

Answer:

C. L

Explanation:

Given that

Displacement of the object is given as

x = A sin(2 n f t)

We know that

Quantity                          Dimensions

Length/Amplitude                  L

Distance /Displacement     L

Time                                     T

Velocity                               LT⁻¹

Acceleration                       LT⁻²

Area                                    L²

Mass                                   M

Frequency                         T⁻¹

Given that x is the displacement that is why the dimensions of the displacement will be L.

Now by balancing the dimensions both sides ,the dimensions of the A will be L.

C. L

4 0
4 years ago
A car has a mass of 1200 kg. A man can comfortably push down with a force of 400 N. If the small piston in a hydraulic jack has
kotegsom [21]
A) F1/A1=F2/A2
F2 = 12000 Newtons, while F1 = 400 Newtons and area A1= 6 cm²
400/6 = 12000/A2
A2 = (6 × 12000)/400
     =  180 cm²
 
b) How long does this lift the car
 d2 =F1/F2×d1
      = (400/12000)× 20
       = (1/30)×20
       = 20/30
       = 0.67 cm
This lifts the car a distance of 0.67 cm
        

4 0
3 years ago
Calculate the average force with which the Sun pulls the Earth. It will help to know
algol13

Answer:

7.9 x 10^21 pound-force

Explanation:

The average distance between the Earth and sun is 150 trillion meters, or 1.5 x 10^11 meters. The mass of the sun is 1.99 x 10^30 kilograms, while the Earth weighs in at 6.0 x 10^24 kilograms. The gravitational constant is 6.67 x 10^-11 meter^3 / (kilogram - second^2). So the Earth and sun pull on each other with a force equal to 3.52 x 10^22 newtons. The newton is a unit of force equal to a kilogram-meter/second^2. One newton is equal to 0.22 of the rarely used English unit called pound-force, so 3.52 x 10^22 newtons is 7.9 x 10^21 pound-force.

4 0
3 years ago
Suppose that the speed of an electron traveling 2.0 km/s is known to an accuracy of 1 part in 105 (i.e., within 0.0010%). What i
OverLord2011 [107]

Answer: 2.89(10)^{-3} m

Explanation:

The <u>Heisenberg uncertainty principle</u> postulates that the fact each particle has a wave associated with it, imposes restrictions on the ability to determine its position and speed at the same time.  

In other words:  

It is impossible to measure simultaneously (according to quantum physics), and with absolute precision, the value of the position and the momentum (linear momentum) of a particle. Thus, in general, the greater the precision in the measurement of one of these magnitudes, the greater the uncertainty in the measure of the other complementary variable.

Mathematically this principle is written as:

\Delta x \geq \frac{h}{4 \pi m \Delta V} (1)

Where:

\Delta x is the uncertainty in the position of the electron

h=6.626(10)^{-34}J.s is the Planck constant

m=9.11(10)^{-31}kg is the mass of the electron

\Delta V is the uncertainty in the velocity of the electron.

If we know the accuracy of the velocity is 0.001\% of the velocity of the electron V=2 km/s=2000 m/s, then \Delta V is:

\Delta V=2000 m/s(0.001\%)

\Delta V=2000 m/s(\frac{0.001}{100})

\Delta V=2(10)^{-2} m/s (2)

Now, the least possible uncertainty in position \Delta x_{min} is:

\Delta x_{min}=\frac{h}{4 \pi m \Delta V} (3)

\Delta x_{min}=\frac{6.626(10)^{-34}J.s}{4 \pi (9.11(10)^{-31}kg) (2(10)^{-2} m/s)} (4)

Finally:

\Delta x_{min}=2.89(10)^{-3} m

5 0
3 years ago
If it takes 100N to push a 300N object up an incline plane , what was the MA of the ramp
nika2105 [10]
I believe the formula you're looking for is force equals mass times acceleration. in this case the answer would be 3.
3 0
3 years ago
Read 2 more answers
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