If the distance doubles, what happens to the force?

A police car on the side of the road (at rest) uses a radar gun to catch speeders as they approach it. The frequency the radar g

oee [108]

Answer:

$\Delta f = 1.49 \times 10^9 Hz$

Explanation:

Apparent frequency that is received to the speeder is given as

$f_1 = f_0\frac{v + v_o}{v}$

$f_1 = (8 \times 10^9)\frac{340 + v_o}{340}$

here we know that

$v_o = 65 mph = 29 m/s$

now we have

$f_1 = (8 \times 10^9)\frac{340 + 29}{340}$

$f_1 = 8.68 \times 10^9 Hz$

now the frequency that is received back from the speeder is given as

$f_2 = f_1\frac{v}{v- v_o}$

$f_2 = (8.68 \times 10^9}\frac{340}{340 - 29}$

$f_2 = 9.49 \times 10^9 Hz$

So difference is the frequency is given as

$\Delta f = 9.49 \times 10^9 - 8 \times 10^9$

$\Delta f = 1.49 \times 10^9 Hz$

4 0

3 years ago

In electric motors and electric generators, which part is responsible for transferring current from the power source to the comm

laiz [17]

The BRUSH <span>In electric motors and electric generators is responsible for transferring current from the power source to the commutator or from the slip rings to where the electricity is needed</span>

5 0

4 years ago

Read 2 more answers

(a) When opening a door, you push on it perpendicularly with a force of 55.0 N at a distance of 0.850m from the hinges. What tor

nadezda [96]

Explanation:

Below is an attachment containing the solution.

7 0

3 years ago

John runs for 10 mins at a uniform speed 9kn/h. At what speed should he run for the next 20mins so that theaverage speed comes t

kolbaska11 [484]

Answer:

13.5 km/h

Explanation:

John runs for 10 min at 9 km/h, then 20 min at v. He will have run a total of 30 min at 12 km/h.

Therefore:

(30 min) (12 km/h) = (10 min) (9 km/h) + (20 min) v

v = 13.5 km/h

4 0

3 years ago

The gravitational acceleration on Earth is 9. 8 m/s2. What is the weight of a car on Earth (to the nearest whole number) if it h

astraxan [27]

Hi there!

Recall the equation for weight.

$W = Mg$

W = Weight (N)

M = Mass (kg)
g = acceleration due to gravity (m/s²)

The weight of an object depends upon its MASS and the strength of the GRAVITATIONAL field. We can solve for weight:

$W = 1360 * 9.8 = \boxed{13,328 N}$

6 0

2 years ago