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With what speed in miles/hr (1 m/s = 2.23 mi/hr) must an object be thrown to reach a height of 91.5 m (equivalent to one football field)? Assume negligible air resistance.
A 195 W (121 V) night light is turned on for an average 6.5 hr a day year round. What is the annual cost of electricity at a billing rate of $0.07 per kWh
During 8.09 seconds a motorcyclist changes his velocity from v1,x = -35.1 m/s and v1,y = 13.7 m/s to v2,x =-24.7 m/s and v2,y = 26.5 m/s
You jump from the top of a boulder to the ground 1.85 m below. Calculate your deceleration on landing
Two capacitors are connected parallel to each other and connected to the battery with voltage 30V . Let C_1 = 9.5 u F ,C2 = 4.7 u F be their capacitances. By how much does the energy of the system decrease
For a safe re-entry into the Earth's atmosphere, the pilots of a space capsule must reduce their speed from 2.6 × 104 m/s to 1.1 × 104 m/s. For how long must they fire their engine
A bat moving with a speed of 3.25 m/s and emitting sound of 36.0 kHz approaches a moth at rest on a tree trunk. What frequency is heard by the moth
A 190 g ball moving at 0.45 m/s in the + x- direction is subject to a 0.15 N force in the - y- direction for 2.5 s. Find the magnitude of the ball's momentum change
An 63 kg weight watcher wishes to climb a mountain to work o? the equivalent of a large piece of chocolate cake rated at 690 kcal (1 kcal = 1000 cal). How high must the person climb
A car starts from rest and travels for 4.7 s with a uniform acceleration of +1.9 m/s2. The driver then applies the brakes, How far has the car gone from its start
A spring (70 N/m) has an equilibrium length of 1.00 m. The spring is compressed to a length of 0.50 }, how far up the slope will the mass move before coming to rest
A light source emits two spectral lines: one at 473 nm and one at 722 nm. what is the distance between the two spectral lines in the first order spectrum
Two identical small insulating balls are suspended by separate 0.22-m threads that are attached to a common point on the ceiling. Each ball has a mass of 8.10 10-4 kg.
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