A loudspeaker in a parked car is producing sound whose frequency is 21440 Hz. A healthy young person with normal hearing is standing nearby on the sidewalk but cannot hear the sound because the frequency is too high. When the car is moving away from the person, the person can hear the sound. If the speed of sound is 343 m/s, what is the minimum speed of the moving car? Number i Units

Constants Part A For the vectors A, B, and C in the figure (Figure 1), find the scalar products Submit Request Answer Part B Figure 1 of 1 Submit Request Answer B (15.0 m) Part C 30.0% D (10.0 m) 53.0 25.0 C (12.0 m) A (8.00 m) Submit Request Answer

The dot product is one way of multiplying two vectors. Figure 3 60° + Ā B 1 of 2 > Part A (Figure 1) shows two vectors A and B. What is their dot product? ► View Available Hint(s) VE ΑΣΦ A.B= Submit Part B Vector C = 21 +43, and vector D = 31 - j. What is their dot product? View Available Hint(s) G| ΑΣΦ č. Ď= ? Submit ?

A boat takes 3.70 hours to travel 45.0 km down a river, then 6.70 hours to return. You may want to review (Pages 91 - 92). Part A How fast is the river flowing? Express your answer with the appropriate units. μA Value Submit Units Request Answer ?

a)Find an expression for the bullet's initial speed v_B in terms of m, M, k, and d. Express your answer in terms of the variables m M k d b)What was the speed of a 1.8 g bullet if the block's mass is 1.1 kg and if the spring, with k = 37 N/m , was compressed by 16 cm? Express your answer in meters per second. c)What percentage of the bullet's energy is "lost"? Express your answer in percent to four significant figures.

Please fill out the template with the work for this problem. Note that you need to have a picture, list of knowns and unknowns, the general equation/s you will use, the math steps to solve for the unknown, only plug in the numbers after you have solved for the unknown, and the answer with units included. _________________________________________________________________________________ A solenoid is producing a magnetic field of B = 8.5 x 10-3 T. It has N = 1300 turns uniformly over a length of d = 0.25 m. Calculate the numerical value of I in amps that the solenoid must have to produce this field.

Listen Calculate the number of seconds that a 53 year old person has lived. Your Answer: Answer units