Answer:

7 true

8 false

9 false

10 false

11 false

12 true

13 true

hope this helps!

Telephone signals are often transmitted over long distances by microwaves. What is the frequency of microwave radiation with a wavelength of 3.5 cm?Express your answer in GHz and using two significant figures.f = ________GHzMicrowave signals are beamed between two mountaintops 52 km apart. How long does it take a signal to travel from one mountaintop to the other?Express your answer in ms and using two significant figures.t = ________ms

A stock person at the local grocery store has a job consisting of the following five segments:1) picking up boxes of tomatoes from the stockroom floor2)accelerating to a comfortable speed.3) Carring the boxes to the tomato display at constant speed.4)decelerating to a stop.5) lowering the boxes slowly to the floor.During which of the five segments of the job does the stock person do positive work on the boxes?A) (2) and (3)B(1) and (2)C) (1) onlyD) (1), (2), (4) and (5)E) (1) and (5)

A Huge water tank is 2m above the ground if the water level on it is 4.9m high and a small opening is there at the bottom then the speed of efflux of non viscous water through the opening will be

The hormone glucagon is released by number of different tissues in the body to stabilize blood glucose levels. Which of the following pathways is least ikely to be activated by glucagon in hepatocytes? cells in the pancreas when blood sugar levels are low. It acts on a gluconeogenesis O glycogenolysis O ? oxidation glycolysis

A heavy object and a light object are dropped from the same height. If we neglect air resistance, which will hit the ground first?

A stock person at the local grocery store has a job consisting of the following five segments:1) picking up boxes of tomatoes from the stockroom floor2)accelerating to a comfortable speed.3) Carring the boxes to the tomato display at constant speed.4)decelerating to a stop.5) lowering the boxes slowly to the floor.During which of the five segments of the job does the stock person do positive work on the boxes?A) (2) and (3)B(1) and (2)C) (1) onlyD) (1), (2), (4) and (5)E) (1) and (5)

A Huge water tank is 2m above the ground if the water level on it is 4.9m high and a small opening is there at the bottom then the speed of efflux of non viscous water through the opening will be

The hormone glucagon is released by number of different tissues in the body to stabilize blood glucose levels. Which of the following pathways is least ikely to be activated by glucagon in hepatocytes? cells in the pancreas when blood sugar levels are low. It acts on a gluconeogenesis O glycogenolysis O ? oxidation glycolysis

A heavy object and a light object are dropped from the same height. If we neglect air resistance, which will hit the ground first?

**Answer:**

The number of available energy states per unit volume is

**Explanation:**

**Given that,**

Average energy

Photon =

**We need to calculate the number of available energy states per unit volume**

**Using formula of energy**

Where, E = energy

h = Planck constant

c = speed of light

Put the value into the formula

**Hence, The number of available energy states per unit volume is **

D = Baseball is a dangerous sport.

P = A player is hit with a ball.

**Answer:**

P

**Explanation:**

If the bat break it will get replaced and you will get another bat,but if u get hit with the ball it's dangerous in many ways

The question seeks to apply Boolean logic, specifically the 'OR' function, to the statement about baseball. In Boolean terms, 'Baseball is a dangerous sport (D)' is true if either 'A bat breaks (B)' or 'A player is hit with a ball (P)' is** true.**

The subject matter of this question is **Boolean logic**, which is a subfield of mathematics. In the provided statement, the sport of baseball (D) is deemed dangerous if either a bat breaks (B) or a player is hit with a ball (P). In terms of Boolean logic, this can be symbolized as 'D = B ∨ P', where ∨ signifies the logical operation 'OR'. Therefore, if either B or P is true (meaning a bat breaks or a player is hit), then D (Baseball is a dangerous sport) is consequentially deemed true.

#SPJ2

**Answer:**

**Explanation:**

Frequency( ν ) 4667 x 10³ Hz = 4.667 x 10⁶ Hz

Energy of one photon = hν [ h is plank's constant ]

= 6.6 x 10⁻³⁴ x 4.667 x 10⁶ = 30.8 x 10⁻²⁸ J

Power = 84 x 10³ J/s

No of photons emitted = Power / energy of one photon

= 84 x 10³ / 30.8 x 10⁻²⁸ =2.727 x 10³¹ per second .

**Answer:**

The width of the slit is **0.167 mm**

**Explanation:**

Wavelength of light,

Distance from screen to slit, D = 88.5 cm = 0.885 m

The distance on the screen between the fifth order minimum and the central maximum is 1.61 cm, y = 1.61 cm = 0.0161 m

**We need to find the width of the slit. The formula for the distance on the screen between the fifth order minimum and the central maximum is :**

**where**

**a = width of the slit**

a = 0.000167 m

**a = 0.167 mm**

**So, the width of the slit is 0.167 mm. Hence, this is the required solution.**

A**) Net Force** is **-6.86N**

B) The y component of **momentum**.

C) The x component of momentum should remain the **same**.

D)The y component of momentum **decreases**.

E)The z component of momentum should remain **constant**.

The following information should be considered:

(A)

The **net force **should be

= -9.8 (0.7)

=** -6.86N**

(B)

Due to the net force is on the y-axis, so only the **vertical component **of the **momentum** should be changed because to the **force**.

(C)

Because there is no resistance of air, the ball should be in **projectile****motion** problems, this represents hat the x component of the **velocity** remains constant, also does the **mass**.

D)

The y component of momentum reduced, this is due to **gravity** reduced the y component of the **velocity**.

E)Because there is no z component of the **force** there is no change in the z component of the **momentum**.

Learn more: brainly.com/question/9122916?referrer=searchResults

With negligible air resistance and low speed, the only significant net force on a 0.7 kg ball is gravity, affecting the ball's y component of momentum. The x component remains constant, and z component changes are not discussed without additional forces.

When a ball of mass 0.7 kg flies through the air at low speed with air resistance negligible, the net force acting on the ball while it is in motion is primarily due to gravity, which will be impacting the *y component* of the ball's momentum. The *x component* of the ball's momentum remains unchanged because no horizontal force is applied, while the *y component* changes due to gravity, and the *z component* would only change if there were forces acting in a direction out of the horizontal plane, which are not mentioned in the scenario. As for the Earth-ball system, momentum is conserved in the vertical direction because the system experiences no net external vertical force.

**Answer:13.6 cm**

**Explanation:**

Given

v(image distance)=-8.5 m

height of object=6 mm

height of image =37.5 cm

and magnification of concave mirror is given by

u=13.6 cm

so object is at a distance of 13.6 cm from mirror.

for focal length

f=-13.4 cm

thus radius of curvature of mirror is R=2f=26.8 cm

The filament of the headlight lamp should be placed about 0.85 m in front of the vertex of the mirror. The radius of curvature for the concave mirror should be approximately 0.85 m.

To determine how far in front of the vertex of the mirror the filament should be placed, we can use the mirror equation:

**1/f = 1/do + 1/di**

Where f is the focal length of the concave mirror, do is the object distance, and di is the image distance.

With the given information, we have:

do = ?

di = 8.50 m

Using the magnification formula:

magnification = -di/do

By substituting the values we know, we can solve for do:

37.5 cm / 6.00 mm = -8.50 m / do

Solving for do, we find that do ≈ - 0.85 m.

Since the object distance cannot be negative, we conclude that the filament of the headlight lamp should be placed about **0.85 m in front of the vertex of the mirror**.

To find the radius of curvature for the concave mirror, we use the mirror formula:

**1/f = 1/do + 1/di**

With do = -0.85 m and di = 8.50 m, we can rearrange the formula to solve for f:

1/f = 1/-0.85 + 1/8.50

1/f ≈ -1.1765

Solving for f, we find that the focal length is approximately **0.85 m**.

#SPJ3