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A balsa-wood raft has the following dimensions: L=2.34m , W= 1.35m , H= 0.65m.
A) what is the total mass of the raft?
B) when the raft is placed in sea water, boxes are placed on top of the raft. If the total mass of the boxes is 32kg, how much of the raft is above water?
C) if the mass of an average person is 72.5kg, how many people can the raft safely support?
A 2.20-uF capacitor is connected across an ac source whose voltage amplitude is kept constant at 60.0V but whose frequency can be varied, Find the current amplitude when the angular frequency is 100 rad/s
A 4.5 kg fish swimming 2 m/s swallows an absent minded 1 kg fish swimming toward it at a velocity that brings both fish to a halt at once after lunch. What is the velocity v of the smaller fish before lunch.
Assume a small child rolls off a bed that is 0.38m above the floor. If the floor is hardwood, the child's head is brought to rest in approximately 2.2mm. If the floor is carpeted, this stopping distance is increased to about 1.1cm.
If the height of the candies in the container increases at the rate of 0.26 cm/s, at what rate (kilograms per minute) does the mass of the candies in the container increase?
A tuning fork vibrating at 666 Hz falls from rest and accelerates at 9.8 m/s 2. How far below point of release is the tuning fork when waves of frequency 626.4 Hz reach the release point? The speed of sound in air is 339 m/s.
Explain how much work does the gravitational force do on the block as the block travels from point P to (a) point Q and (b) the top of the loop?
The pressure in a traveling sound wave is given by the following equation. p = (2.1 Pa) sin ?[(1.40 m-1)x - (280 s-1)t], Find the pressure amplitude and Find the wavelength
Two 1.5cm -diameter disks face each other, 1.1mm apart. They are charged to ±20nC. What is the electric field strength between the disks
A common belief is that a hole in a jet plane can suck a person out, Calculate the fractional difference between this force and the weight wman of a typical adult male (185 lb)
Two steel guitar strings have the same length. String A has a diameter of 0.59 mm and is under 450.0 N of tension. String B has a diameter of 1.2 mm and is under a tension of 800.0 N. Find the ratio of the wave speeds, va/vb, in these two strings.
Boat A negotiates a curve whose radius is 363m. Boat B negotiates a curve whose radius is 110m. Each boat experiences the similar centripetal acceleration. What is the ratio of speed of boat A to that of boat B.
The engineer has done a survey and found that almost no one complains if the force directed up the ramp is no more than 20 .Ignoring friction, illustrate at what maximum angle should the ramps be built, assuming a full 28 grocery cart?
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