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In an action-adventure film, the hero is supposed to throw a grenade from his car, which is going 90.0 km/h. to his enemy's car which is going 110 km.h. The enemy's car is 15.8m in front of the hero's when he lets go of the grenade. If the hero throws the grenade so its initial velocity relative to him is at an angle of45oabove the horizontal, what should the magnitude of the initial velocity be? The cars are both traveling in the same direction on a level road. You can ignore air resistance. Find the magnitude of the velocity both relative to the hero and relative to the earth?
White light reflected at perpendicular incidence from a uniform soap film has an interference maximum at 480.0 nm, what is the film thickness
If the only forces acting on a 2.0-kg mass are N and N, what is the magnitude of the acceleration of the particle
A standing wave is oscillating at 140 Hz on a string, as shown in the figure. What is the speed of traveling waves on this string
Suppose the temperature of 4.63 L of ideal gas drops from 353 K to 275 K. (a) If the volume remains constant and the initial pressure is atmospheric pressure, find the final pressure. Pa (b) Find the number of moles of gas. mol
A 60 kg person drops from rest a distance of 1.20m to a platform of negligible mass supported by a stiff spring. The platform drops 6cm before the person comes to rest.
The portion of the board on the table measures .30m and the portion of the table measures .20m. Explain how far can the center of the box be over the table before the board begins to tilt?
A 2.2hp electric motor on a water well pumps water from 14m below the surface. How many liters of water does the motor pump in 2.0hr
A hypothetical charged particle passes without deflection through crossed electric and magnetic fields of strengths 6940 V/m and 0.125 T, respectively. What is the particle's charge-to-mass ratio
A high-speed lifting mechanism supports a 745-kg object with a steel cable that is 31.0 m long and 4.00 cm2 in cross-sectional area. Determine the elongation of the cable
Water has a mass per mole of 18.0 g/mol, and each water molecule (H2O) has 10 electrons. (a) How many electrons are there in 4.79 liters of water? (1 liter is equivalent to 1.00 × 10-3 m3) (b) What is the net charge of all these electrons?
A uniform electric field exists everywhere in the x, y plane. This electric field has a magnitude of 6000 N/C, Find the magnitude of the net electric field at x = -0.18 m
a hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. estimate the length of the lake
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