A small fly of mass 0.28 g is caught in a spider's web. The web oscillates predominantly with a frequency of 4.3 Hz at what frequency would you expect the web to oscillate if an insect of mass 0.60 g were trapped?
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- The jumping ability of the African desert locust was measured by placing the insect on a force plate, a platform that can accurately measure the force that acts on it. When the locust jumped straight up, its acceleration was measured to follow the curve shown. What was the maximum force that this 0.50 g locust exerted on the force plate?Activity 2. A hunter observed a bird flying overhead and estimated the height at 15m and its speed at 20 m/s. His rifle is capable of a muzzle velocity of 48 m/s. If he fires at the instant the bird is directly overhead, at what angle should he incline his rifle in order to hit it? How many meters from his position will the bird hit the ground assuming that the weight of the bullet compared to the weight of the bird is negligible?A bat is flitting about in a cave, navigating via ultrasonic bleeps. Assume that the sound emission frequency of the bat is 37.1 kHz. During one fast swoop directly toward a flat wall surface, the bat is moving at 0.030 times the speed of sound in air. What frequency does the bat hear reflected off the wall? Number i Units
- 7.12 When a sound wave with a certain intensity is detected by the tympanic membrane (eardrum) the amplitude of the resultant motion is 1.0 nm (1.0 × 10−9 m). If the frequency of the sound is 600 Hz what is the maximum speed of the membrane oscillation?Activity 2. A hunter observed a bird flying overhead and estimated the height at 15m and its speed at 20 m/s. His rifle is capable of a muzzle velocity of 48 m/s. If he fires at the instant the bird is directly overhead, at what angle should he incline his rifle in order to hit it? How many meters from his position will the bird hit the ground assuming that the weight of the bullet compared to the weight of the bird is negligible? 20m/s 48m/s 15m 0=? d X d = ?Problem 4. Hummingbirds use their long tongues to collect floral nectar (Fig. 4a-b). The distal portion of the bird's tongue consists of thin keratinized membrane that spontaneously folds into two conjoining tubes when extended (Fig. 4c-d). Additionally, hummingbirds have no muscular control over the shape of its tongue and active suction is impossible; instead, they rely on capillarity to drive up the nectar. Once the tongue is loaded with nectar, it is retracted into the bill for ingestion. Given nectar has a density of p = 1060 kg/m³, surface tension of y = 0.052 N/m, the contact angle between the hummingbird's tongue and nectar is 0 = 30°, determine the maximum volume of nectar the hummingbird can imbibe each time it dips into the jar (Fig. 5). (a) (b) (c) 50 ms (d) Nectar Cross section Posterior view Air Figure 4: (a) Hummingbirds drink nectar, a sweet liquid inside certain flowers. (b) Anatomy of hummingbirds. (c) Hummingbird's tongue spontaneuously folds into two conjoining…
- R1HW 1) What is the maximum strength of the B field in an electromagnetic wave that has a maximum E-field strength of 1000 V/m? 2) The beam from a small laboratory laser typically has an intensity of about 1.0 x 10-3 W/m2. Assuming that the beam is composed of plane waves, calculate the amplitudes of the electric and magnetic fields in the beam. 3) A 60-kW radio transmitter on Earth sends its signal to a satellite 100 km away (below). At what distance in the same direction would the signal have the same maximum field strength if the transmitter's output power were increased to 90 kW? 1/10/2022 Dr AQEEL SAUM Ralub) A 50.0 gm object connected with an amplitude of 4.0 cm on a frictionless, horizontal surface. Find i) the total energy of the system. ii) the speed of the object when its position is 1.0 cm. iii) kinetic energy and potential energy when its position is 3.0 cm. a) What are forced vibrations? Examine the effect of a periodic force on the motion of a damped oscillator. 2. b) The amplitude b of forced vibration in a mechanical system is given by fo [(m-@?)² + 4r²oz Show that for i) o> 0o, the response is independent of the spring constant of the system. 1| M-75354 1720 3. a) With the appropriate diagram, explain the working of a Michelson's interferometer and derive the expression for bright and dark fringes. b) In Michelson's interferometer a thin plate is introduced in the path of one of the beams and it is found that 50 band crosses the line of observation. If the wavelength of light used in 5896Å and u= 1.35, determine the thickness of the plate. 4. a) Explain the Einstein's theory…
- The relationship between speed and density on a highway highway is governed by Uf = 100-018K U₁ Thursday 2-4 LECTURE 1 w At a flow of loovehlhr a slow moving truck with a Speed of 20km Ihr enters the road & exits after 800m. estimate i] Speed of the Shockwaves 11] Distance the platoon will reach STIGA 02 Man on attit odony (veys ra Mun QueA uniform thin rod (ML2) of length 0.6 m and mass 7.5 kg can rotate in a horizontal plane about a vertical 12 axis through its center. The rod is at rest when a 9.9 g bullet traveling in the rotation plane is fired into one end of the rod. The bullet's path makes angle e = 60° with the rod. If the bullet buried in the rod and the angular velocity of the rod is 10 rad/s immediately after the collision, what is the bullet's speed (in m/s) just before impact? Axis Answer:A 0.25 kg baseball is travelling horizontally to the right at 40 m/s when it was hit by a bat and it bounced off at 60 m/s 60o above the horizontal to the left. How much impulse was applied to the ball by the baseball bat?