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Sati [7]
3 years ago
13

In a concave mirror, if the object is located beyond the center of curvature the image formed is real, inverted, and smaller tha

n the object. but, if the object is located between the center of curvature and the focal point, the image is real, inverted, and ____ Than the object
A) Also smaller
B) Lager
C) The same size
D) Disappears
Physics
1 answer:
Katyanochek1 [597]3 years ago
7 0
B i think its b im not sure if its right
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A runner makes one lap around a 200 m track in a time of 25.0 s. What was the runner's average speed?
creativ13 [48]
The answer is 8 meters per second 8m/s because 200 divided by 25 is 8 
3 0
4 years ago
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A concrete highway is built of slabs 12 m long (20°C). How wide should the expansion cracks between the slabs be (at 20°C) to pr
Bezzdna [24]

Answer:

0.001152m

Explanation:

Linear expansivity of a material is the change in length of the material per unit length per degree rise in temperature. Mathematically,

¢ = ∆L/L1∆°C

¢ is the linear expansivity of the material = 12 x 10⁻⁶ °C⁻¹

Where ∆L is the change in length = L2-L1

L2 is the final length = ?

L1 is the initial length = 12m

∆°C is the change in temperature = °C2 - °C1 = 50-(-30) = 80°C

Substituting this values inside the formula to get the final length L2 after expansion, we have;

12 x 10⁻⁶ °C⁻¹ = L2-12/12×80

12 x 10⁻⁶ °C⁻¹ = L2-12/960

L2-12= 960×12 x 10⁻⁶ °C⁻¹

L2-12 = 0.001152

L2 = 12+0.001152

L2 = 12.001152m

Expansion will be the change in length L2-L1 = 12.001152-12

= 0.001152m

The expansion cracks between the slabs should be 0.001152m wide to prevent buckling

5 0
3 years ago
The half-life of a certain isotope is 12 years. How much of a 600 g sample will remain after 36 years?
miskamm [114]

36/12= 3   3 IS THE AMOUT OF HALFLIVES

ONE HALF LIFE = 300

TWO HALF LIFE = 150

THREE HALF LIFE = 75


*Divide 600 three times

8 0
4 years ago
Which wave interaction results in a change in the direction of the wave as it passes through one medium to another medium?
Svetllana [295]

Explanation :

The phenomena in which the ray of light bend towards or away from the normal is called the refraction of light. Light always travels in straight line. If the speed of light in both medium differs then refraction occurs.  

According to Snell's law :

\dfrac{sin\ \theta_1}{sin\ \theta_2}=\dfrac{v_1}{v_2}=\dfrac{n_2}{n_1}

Where n_1 and  n_2 is the refractive indices of two medium 1 and medium 2.

v_1 and  v_2 is the speed of light in medium 1 and medium 2.

Hence, the given figure shows the refraction of light.

7 0
3 years ago
Read 2 more answers
A potential drop of 50. volts is measured across a
ollegr [7]

Answer:

Power, P is equal to 10 watts.

Explanation:

Given the following parameters;

Voltage drop, V = 50volts.

Resistance, R = 250ohms.

Power, P =?

The power developed in an electrical circuit is given by;

P = IV ......equation 1

But we also know that;

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, V = IR

Making I the subject of formula;

I = V/R

Substituting into equation 1;

P = (V²)/R

P = (50²)/250

P = 2500/250

P = 10 watts.

5 0
3 years ago
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