Recent content by thschica

A hair dryer has two settings: 840 W and 1320 W. (a) At which setting do you expect the resistance to be higher? 840 W correct After making a guess, determine the resistance at each setting. (b) 840 W setting (c) 1320 W setting Homework Equations I am not exactly sure what...

A 50 dB sound wave strikes an eardrum whose area is 4.1 * 10-5 m2. (a) How much energy is absorbed by the eardrum per second? W (b) At this rate, how long would it take your eardrum to receive a total energy of 1.0 J? years I have tried to solve using I=2pi^2f^2A^2pv and got f=280 ...

I have tried this problem many times using different equations and none of them have worked how do I solve this? A cord of mass 0.51 kg is stretched between two supports 26 m apart. If the tension in the cord is 148 N, how long will it take a pulse to travel from one support to the other?

Studying for exams need help very soon! On both of these I got the right answer but it was so long ago I have no idea how to do them. (Which equation am I to use?)(v=Vo+at? if so how?) 1.Determine the stopping distances for an automobile with an initial speed of 91 km/h and human reaction...

6. A car is driven 140 km west and then 30 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)? ? km ( I know that this one is 162.5) ?° south of west ( I have no idea how to find this answer) :bugeye:

should a) be 4394.7 and b) be 3716.4

A 6520 kg helicopter accelerates upward at 0.57 m/s2 while lifting a 1190 kg car. (a) What is the lift force exerted by the air on the rotors? _________ N (b) What is the tension in the cable (ignore its mass) that connects the car to the helicopter? _____N I have no idea how to do...

I understand #2 but #1 is still very confusing to me and I don't know how to do it.

I am not sure how I am supposed to do these problems and I am going to be tested on them soon can someone please help me. 1) An 83 g arrow is fired from a bow whose string exerts an average force of 95 N on the arrow over a distance of 85 cm. What is the speed of the arrow as it leaves the...

A passenger on a boat moving at 1.13 m/s on a still lake walks up a flight of stairs at a speed of 0.50 m/s, Fig. 3-44. The stairs are angled at 45° pointing in the direction of motion as shown. What is the velocity of the passenger relative to the water? :cry: I have to get the magnitude of...

A swimmer is capable of swimming 1.15 m/s in still water. (a) If she aims her body directly across a 150 m wide river whose current is 0.80 m/s, how far downstream (from a point opposite her starting point) will she land? :cry: I have tried this twice and I have gotten the wrong answer does...

During a rodeo, a clown runs 8.0 m north, turns 35 degrees east of north, and runs 3.5 m. Then, after waiting for the bull to come near, the clown turns due east and runs 5.0 m to exit the arena. What is the magnitude of the clown's total displacement? When I did this I got a trapazoid...

Thank you I just got the answer right (49)

Is the vector sum 50 meters?How do you get it?

A football player runs directly down the field for 35 m before turning to the right at an angle of 25 degrees from his original direction and running an additional 15 m before getting tackled. What is the magnitude of the runner's total displacement? I got 38.08 but it is not right can...